WEBVTT 00:05.890 --> 00:11.860 Read the end of the section so we'll be doing the final part of the mini project that was started in 00:11.860 --> 00:19.150 the last section and this will be the last lecture that we will do practice in the next section. 00:19.150 --> 00:26.020 We'll have more of the library that we're going to use for the final game. 00:26.260 --> 00:29.530 So we're not really going to do much practice with that. 00:29.530 --> 00:32.730 We'll just use it for the final game instead. 00:33.560 --> 00:42.920 So the final part of this Me project says Replace the C strings with C++ strings. 00:43.220 --> 00:50.580 Use a vector instead of dynamic memory and use a text file instead of a binary file. 00:50.720 --> 00:54.800 So we'll get to the rest of this later. 00:54.800 --> 01:02.080 So first what I really want to do is when when approaching a problem like this where you do kind of 01:02.080 --> 01:06.210 a revision of what you've done before. 01:06.520 --> 01:13.810 Really what you want to do is to get to parity with the last version. 01:13.870 --> 01:22.300 So you want to update the strings with the C++ strings and a vector and the text file and just get everything 01:22.300 --> 01:24.190 working like it was before. 01:24.360 --> 01:35.480 OK so we'll start with changing the strings or the C strings to use strings so will need an set of string. 01:35.480 --> 01:43.970 Or any CPP just regular strings of strings and are going to also include the vector 01:47.170 --> 01:56.380 K and the next thing we'll do is we'll change the data to reflect the changes that we need. 01:56.380 --> 02:00.440 So will do a string for a first name 02:03.160 --> 02:08.550 string for the last. 02:09.400 --> 02:14.530 And instead of having the memory like we have here. 02:14.590 --> 02:27.330 You will just use a vector so that this will do a vector of contacts. 02:27.530 --> 02:35.510 Contact us and notice that it's not like an old pointer of contacts just contacts because vector itself 02:35.510 --> 02:38.690 will do all the dynamic memory for us. 02:38.820 --> 02:46.950 OK so now that we've kind of changed the data and we should also change this as well. 02:47.110 --> 02:47.980 TXT file 02:52.000 --> 02:58.080 now that you've done these kind of data changes we'll have to update our code to reflect the change. 02:58.130 --> 03:07.020 So we're going to go through the whole thing and then just make whatever changes are necessary. 03:07.580 --> 03:15.170 So here we don't need any of this in the main because this kind of had to do with the dynamic memory 03:15.170 --> 03:15.860 portion of it. 03:15.860 --> 03:20.300 So this kind of remove it. 03:20.940 --> 03:27.570 We don't need to delete it after because the vector will actually take care of that for us 03:30.150 --> 03:39.910 and that's it for this for now although you'll see why. 03:40.180 --> 03:46.160 Oh well if we don't if we can't read the file We're just not going to bother. 03:46.260 --> 03:58.860 OK so we're was going to load the contacts so they and in fact we won't need to create the file anymore 03:58.920 --> 04:02.460 because again if we don't have the file then that's fine. 04:06.510 --> 04:12.670 So now we will. 04:13.110 --> 04:15.430 We don't need this function anymore. 04:17.950 --> 04:23.970 Take away and all of this is needs changing. 04:24.010 --> 04:26.140 So it's not binary anymore. 04:28.990 --> 04:38.060 And let's just sort of remove all this and in a minute we will rewrite it. 04:39.740 --> 04:42.520 It will do the same for the save 04:48.230 --> 04:58.200 So we we don't need to resize the context at all because our vector for us so is this function entirely 04:59.470 --> 05:05.570 in for the display. 05:05.840 --> 05:12.320 You have to use the actual size function of the contact's vector. 05:12.720 --> 05:14.840 That's how many contacts we have now. 05:16.210 --> 05:27.280 And have these 0.10 contacts just contacts this. 05:27.630 --> 05:31.730 How will this play an option. 05:31.740 --> 05:39.650 We started with the resize but again we don't need to resize it because factor that for us we don't 05:39.650 --> 05:46.310 need to add 1 to the number of contacts anymore because again once we add it properly it will just kind 05:46.310 --> 05:48.050 of work. 05:48.060 --> 05:51.940 So how do we fix this. 05:51.960 --> 06:00.720 Right now it's getting the string as a C string but instead of that let's change this function to use 06:00.780 --> 06:03.600 as a C plus string. 06:04.150 --> 06:09.870 So when you have a new contact 06:14.440 --> 06:15.310 like so. 06:15.970 --> 06:18.050 And we're going to use it here. 06:18.070 --> 06:27.510 So we're going to change this to be our new content. 06:28.840 --> 06:32.140 And now we don't need this size anymore. 06:32.150 --> 06:33.080 It could be big. 06:33.100 --> 06:33.730 We want 06:37.300 --> 06:39.660 a new contact here. 06:43.170 --> 06:45.110 Like that. 06:46.050 --> 06:56.770 And similarly here we just get the new content and here will just add it to the context to be 07:03.900 --> 07:06.810 pushed back to do so just add it to the end. 07:07.930 --> 07:15.700 It doesn't really matter the order for now and now we need to change this get string function to use 07:16.740 --> 07:19.090 C++ strings and Cives Caesar. 07:19.250 --> 07:32.110 So in that file and we'll need the string library here in this and we just change this to be a string 07:33.040 --> 07:41.620 and we'll need to use stood colon colon because we're not going to put the line using namespace studio 07:41.670 --> 07:42.280 here. 07:42.430 --> 07:43.100 OK. 07:43.330 --> 07:49.610 So if you don't have the using names is SDD when you actually say the actual namespace and then call 07:49.650 --> 07:56.380 in Colon and then here will say string and we'll pass it by reference. 07:56.430 --> 07:58.760 Name it a string. 08:01.980 --> 08:05.900 And now we need to change the station as well. 08:07.350 --> 08:10.530 We scroll down to it here. 08:11.420 --> 08:12.930 This needs to be a string 08:16.010 --> 08:16.580 blustering 08:22.930 --> 08:27.920 and we could change some of the stuff so we don't need these two lines anymore. 08:28.390 --> 08:35.240 We just need to say see in string because CNH works with small strings just fine. 08:35.970 --> 08:50.050 And here we could just say string dot it's way that way and it's really all we need to do is function 08:51.710 --> 08:54.790 back. 08:55.140 --> 09:04.290 OK so we're creating new contact we're just populating that contacts first name last name and his phone 09:04.290 --> 09:09.520 number and then just pushing it back into our contacts vector. 09:10.690 --> 09:13.480 And saving it just like normal. 09:13.630 --> 09:21.580 So now that that's done let's start tackling the load contacts and save contex. 09:21.590 --> 09:23.480 Let's start with the Save contacts 09:26.440 --> 09:29.890 easier slightly easier. 09:29.890 --> 09:34.040 All you have to do is go through each each contact. 09:34.550 --> 09:38.160 For his last then contacts 09:40.340 --> 09:44.480 the dot contacts site. 09:44.770 --> 09:45.950 That's how many there are 09:50.020 --> 09:58.020 and we need to output those contacts to the file and we'll do that. 09:58.070 --> 10:08.240 And I was out with our file do that with the insertion operator and we'll see what contacts the contacts 10:08.790 --> 10:16.380 I adopt first name and we'll put a space between the names and the phone number as well. 10:17.270 --> 10:22.280 Contacts the contacts 10:24.760 --> 10:25.520 last name 10:31.960 --> 10:37.480 the contacts. 10:37.710 --> 10:38.000 It's 10:42.160 --> 10:46.450 like that. 10:46.790 --> 10:52.900 So this will actually print out to the file one on one contact essentially. 10:53.040 --> 10:57.340 So each line of the file will be one contact. 10:57.500 --> 10:57.960 OK. 10:58.730 --> 11:06.140 And now I only want to output new lines if 11:09.350 --> 11:14.510 if there are more contacts after me. 11:14.630 --> 11:18.460 So after the current one Ratsch the either one right. 11:18.550 --> 11:19.410 OK. 11:19.530 --> 11:27.090 So we'll say contacts size minus one. 11:27.120 --> 11:35.160 So as long as I is less than the last contact and the index of the last contact which is this right 11:35.160 --> 11:42.730 here then will output a new line. 11:42.750 --> 11:45.420 This is to make sure. 11:45.450 --> 11:55.670 So make sure that there is no new line. 11:56.020 --> 12:06.870 And file is what this is saying essentially and you may be wondering why don't we. 12:06.870 --> 12:08.520 Why do we care about that. 12:08.550 --> 12:15.630 Well sometimes the way we read in the way we'll be reading it in that will cause a problem if there 12:15.630 --> 12:15.910 is. 12:15.930 --> 12:19.950 So we're going to kind of make sure that doesn't happen. 12:20.110 --> 12:31.590 OK so now look at load contacts function and here will say we'll just get a new contract. 12:31.870 --> 12:32.730 This will be our 12:36.270 --> 12:39.540 the one that we store. 12:39.570 --> 12:42.930 Each line will read a contact and then we'll store it into this one. 12:43.060 --> 12:48.340 OK and we'll say while not in file. 12:51.000 --> 12:52.030 OK. 12:52.200 --> 12:58.020 And what this is is while we're not at the end of the file. 12:58.170 --> 13:06.930 So each file has kind of a marker at the very end of it which signifies that that's the end of the file. 13:07.260 --> 13:13.290 And this is all this is doing and saying wow the the current cursor of the file is not at the end of 13:13.290 --> 13:14.470 the file. 13:14.760 --> 13:18.300 That's what we're doing here say in file. 13:18.870 --> 13:29.610 So we'll read any whitespace first and then if if the file was empty let's say. 13:29.780 --> 13:38.010 So if we're at the end of the file already then we should just get out of the file OK. 13:38.260 --> 13:43.880 So this has to do with this kind of whitespace problem. 13:43.910 --> 13:51.410 It was always kind of a weird problem in textfiles as usual I don't really like to use them that much. 13:51.910 --> 13:56.640 So we'll just read the line contacts. 13:56.870 --> 14:01.100 It's and you contact 14:05.400 --> 14:06.120 first name 14:08.750 --> 14:11.120 you contact each 14:16.910 --> 14:20.290 last name and get the phone numbers. 14:20.300 --> 14:20.900 Wow. 14:26.240 --> 14:32.670 And again this extraction operator can read strings. 14:33.050 --> 14:35.960 It's overloaded to read strings so. 14:36.210 --> 14:37.370 And this will also 14:42.090 --> 14:45.610 this will also ignore whitespace. 14:45.780 --> 14:49.870 So these kind of white spaces that we put in here you'll just be ignored. 14:49.910 --> 14:53.420 So this will be fine. 14:53.450 --> 14:55.810 And then we just add it to the database. 15:06.710 --> 15:08.610 Using pushback. 15:11.610 --> 15:11.990 Dr. 15:16.610 --> 15:27.280 in it's I think it it's like I said before we don't really care if the file exists or not we'll just 15:27.390 --> 15:28.820 it will just be empty. 15:28.880 --> 15:29.420 Right. 15:32.230 --> 15:40.110 The vector to removing the file or the functions that need. 15:40.320 --> 15:43.670 And if we run this 15:47.020 --> 15:51.610 you'll see that you have no contacts in. 15:51.790 --> 15:52.330 I don't 15:57.330 --> 15:58.850 display that. 15:59.010 --> 16:00.180 So I one one 16:07.150 --> 16:08.130 display. 16:08.410 --> 16:17.060 So we have and quit and that's just rerun it and make sure that C properly display. 16:17.650 --> 16:20.320 So we have our two contacts. 16:21.400 --> 16:22.440 So that's good. 16:22.450 --> 16:27.130 So it's basically working as it did before. 16:27.520 --> 16:31.740 And if you want to see the file See 16:39.280 --> 16:45.380 here's the file that saved and it's in nice text that we can understand. 16:45.970 --> 16:52.250 So says Fred Flintstone on one line with the space just like how we save it 16:55.450 --> 17:00.810 is a first name last name first name last name in 17:07.280 --> 17:07.490 that 17:11.210 --> 17:12.020 phone. 17:13.520 --> 17:21.550 And noticed that we read it in the same way so read back in first name last name or number. 17:22.130 --> 17:27.760 So that kind of parity now with what we had before. 17:28.040 --> 17:31.330 Now let's add in the rest of what it said. 17:31.340 --> 17:39.240 So it says really a function that will remove a contact from the vector make this an option in the main 17:39.260 --> 17:40.930 that way. 17:41.150 --> 17:43.210 So let's do that. 17:43.250 --> 17:49.380 So we'll add any function says void. 17:49.530 --> 17:50.730 Remove option 17:53.310 --> 17:55.100 2 contacts divi 17:58.020 --> 18:02.360 reference. 18:06.730 --> 18:14.270 Add it to an. 18:14.610 --> 18:20.730 And we need to as I said here make this an option and make menus. 18:20.730 --> 18:23.830 You need to change the main menu here. 18:24.060 --> 18:25.990 Option user. 18:26.290 --> 18:35.660 And we'll add it right after AD contex say our eyes remove contact 18:39.320 --> 18:43.830 whine like that and add it here as well. 18:43.860 --> 18:46.390 Our right. 18:46.440 --> 18:51.630 It's a new option and it's three four options. 18:52.550 --> 18:54.190 And we have four options. 18:54.230 --> 19:03.280 And in this execute you need to change it so there is a new case to remove option. 19:11.400 --> 19:11.600 Number 19:17.000 --> 19:28.900 OK so let's let's just run this and see hopefully make steak so see that there is play add in or move 19:28.960 --> 19:30.350 straight to. 19:30.490 --> 19:31.970 Nothing happens yet. 19:32.080 --> 19:33.180 We have implemented it. 19:33.490 --> 19:34.850 So that's fine. 19:38.340 --> 19:44.330 So let's implement remove the Remove the options. 19:45.940 --> 19:47.710 Here we will. 19:47.710 --> 19:49.560 How will we do this. 19:49.620 --> 19:57.070 So how will the user know which one to remove. 19:57.200 --> 20:01.370 We could make them enter the first name and last name maybe. 20:01.400 --> 20:05.060 But what if they have the same name like John Smith. 20:05.060 --> 20:10.380 So we actually remove it by phone number so 20:12.980 --> 20:20.920 first we'll check to see if we have any contacts at all because if we don't then there's no point removed. 20:20.950 --> 20:21.170 Right 20:24.950 --> 20:28.980 Size like that. 20:29.080 --> 20:31.920 So it's greater than zero. 20:31.950 --> 20:32.470 Right. 20:33.500 --> 20:39.150 Or if we say less than or equal to zero we could say ouch. 20:39.370 --> 20:48.450 No contacts in the list. 20:49.110 --> 20:53.390 And would just return like that. 20:53.460 --> 20:57.020 So you could do a return with nothing right. 20:57.120 --> 20:59.780 If it's void. 21:00.180 --> 21:04.390 So this will just kind of exit the function. 21:04.440 --> 21:16.500 So if we do have contacts so if we do get to this point we should probably I guess input the phone number 21:18.220 --> 21:24.820 we could do it by could do it by first name my last name but again there might be the same last name 21:27.380 --> 21:29.310 but maybe that will be better. 21:29.310 --> 21:33.190 It could be a better option at least to see visually. 21:33.230 --> 21:34.600 So maybe that's what we'll do. 21:34.610 --> 21:45.220 So we'll say string and this also helps us with using strings more string first names and last name 21:47.170 --> 21:56.170 really what you want is some kind of ID for every for every contact and we you would actually remove 21:56.170 --> 21:58.020 it based off. 21:58.120 --> 21:59.490 But we're not going to do it here. 21:59.500 --> 22:08.440 So we'll actually get the first name and last name from the users say please enter first name 22:12.140 --> 22:14.380 in Pasadena hairspring 22:18.680 --> 22:42.520 first name it's right you get the last name. 22:42.700 --> 22:49.930 So now that we have the first name and last name we have to actually go through our vector and see if 22:50.050 --> 22:53.800 anyone matches up with that first name and last name. 22:53.800 --> 23:01.090 OK so we'll need some kind of boolean to know if we found it or not and we'll just kind of delete the 23:01.090 --> 23:07.470 first one we find so if there's duplicate say there's like two John Smiths Woods delete the first one 23:09.230 --> 23:14.560 and it's the index that we found it at. 23:14.610 --> 23:21.560 Found index will start at negative 1 because negative 1 will signify that we don't. 23:21.600 --> 23:23.220 You haven't found anything. 23:24.390 --> 23:33.250 It's only zero is less than the number of contacts in the database 23:36.770 --> 23:39.220 signs. 23:41.300 --> 23:42.140 So it's 23:45.340 --> 23:51.310 and we haven't found it. 23:51.390 --> 23:57.180 It's both conditions because if we do find it then we'll just kind of exit it. 23:57.640 --> 24:01.720 So if the current one that we're looking at 24:08.490 --> 24:10.200 is equal to the first name 24:13.650 --> 24:14.490 and 24:19.060 --> 24:20.620 if it's equal to 24:23.310 --> 24:24.510 the last name 24:28.090 --> 24:29.500 then we found it. 24:29.770 --> 24:32.340 So it's true. 24:36.080 --> 24:38.570 Index found index 24:41.170 --> 24:42.910 is the current one. 24:42.960 --> 24:44.210 I one day 24:47.680 --> 24:55.180 so now that we found it we should check to see if it found it or if have all. 24:55.180 --> 24:58.690 So if we found it then how do you remove something. 24:58.690 --> 25:07.720 All we've learned so far is pop back right in our vector. 25:07.740 --> 25:08.380 OK. 25:08.660 --> 25:21.720 So how could you remove a contact at any position by only using the E by only popping the last one. 25:21.790 --> 25:24.490 So how you could do this 25:26.890 --> 25:36.220 is swapping the last one for the for the one that we found and then we'll swap it we'll swap the last 25:36.220 --> 25:40.420 one in the vector for that first one. 25:40.420 --> 25:47.140 So now that the the one we found is at the end and then we'll just pop that one. 25:47.530 --> 25:54.790 So in order to do this we'll need the swap function and we could again we could write it ourselves. 25:54.820 --> 26:10.390 But actually an algorithm that will need anyway it has the swap functions for a swap and sort K so what's 26:10.850 --> 26:22.210 let's use it so we'll swap the one that we found with the very last the very last one if there is any. 26:22.520 --> 26:33.270 So I'll say swap and say contacts eata contacts. 26:34.800 --> 26:37.850 Or of the found index right. 26:38.410 --> 26:41.090 Swap this one with the last one 26:44.640 --> 26:46.300 how to get the last one. 26:46.300 --> 26:49.340 Well it's fairly simple. 26:49.550 --> 26:55.360 Contacts the contacts got size right. 26:55.430 --> 26:57.880 Minus one right. 26:57.980 --> 27:05.390 So remember that vectors are effectively just an array and always to get the very last element in an 27:05.390 --> 27:06.290 array. 27:06.320 --> 27:10.830 It's always the length of the reais minus one for that index. 27:10.840 --> 27:11.540 OK. 27:11.840 --> 27:25.480 So this will put the found index at the end and and then all you have to do is say contact D-B dot contacts 27:27.000 --> 27:38.550 up pop back gay I'll remove it and then we'll just say well I moved out. 27:41.100 --> 27:41.790 Moved 27:46.940 --> 27:47.980 first. 27:48.150 --> 27:49.010 I mean 27:52.090 --> 27:52.740 last night 27:57.960 --> 27:59.760 from contex 28:04.630 --> 28:05.630 like that. 28:05.860 --> 28:09.860 And if we didn't find it we're just output to the user that we didn't find it. 28:10.020 --> 28:11.350 Yeah. 28:12.430 --> 28:14.700 Could not find 28:18.100 --> 28:19.750 his name. 28:23.380 --> 28:24.250 Last name 28:27.350 --> 28:29.410 in. 28:33.870 --> 28:36.560 Resemble. 28:36.640 --> 28:44.560 And so it's kind of go over this one more time so we have no we have no contacts don't do this option. 28:44.560 --> 28:47.770 All right and we use this return with nothing. 28:47.770 --> 28:52.580 I think that's the first time we've ever seen this use use this way. 28:52.780 --> 28:59.920 So if it's a void function and you return nothing they will just exit the function and just exit. 29:00.010 --> 29:09.430 It's a function that day and we'll get the first name the last name and we'll search obviously search 29:09.430 --> 29:16.320 the contacts D-B see if we can find someone with that first name and that last name. 29:16.540 --> 29:25.150 And if we do we'll effectively store that index and say that we found it right in now we'll actually 29:25.150 --> 29:28.220 break out of the loop on the next iteration. 29:28.230 --> 29:29.000 Okay. 29:29.710 --> 29:39.670 And then if we found it we'll swap that index the found index with the very last very last 29:42.210 --> 29:43.020 index. 29:43.120 --> 29:50.820 OK the last element of the vector and then pop the last element and then say it. 29:51.070 --> 29:51.860 OK. 29:52.270 --> 29:55.800 So let's think we've set this all up. 29:55.810 --> 29:59.660 So let's run this and see what happens. 30:04.520 --> 30:06.290 So it's display. 30:06.290 --> 30:10.150 So we have Fred and Barney. 30:10.420 --> 30:12.210 So let's remove. 30:12.640 --> 30:20.150 So enter the first name let's remove Fred. 30:20.380 --> 30:24.640 So he's been removed from contacts and let's see if that's actually true. 30:25.050 --> 30:26.660 And all we have is Barnie. 30:26.940 --> 30:28.390 OK. 30:28.620 --> 30:29.770 It's quiet. 30:30.230 --> 30:34.160 And that's actually check to see 30:36.430 --> 30:37.330 if 30:43.070 --> 30:48.600 it's checked to see if we don't have fretted more. 30:48.970 --> 30:52.700 And if you look at the contacts we don't have right. 30:52.820 --> 30:53.320 OK. 30:55.950 --> 31:03.720 Now the last thing we need to do is say change the display option to have the user choose the order 31:03.720 --> 31:05.380 in which to display. 31:05.460 --> 31:16.290 So we can either sort it by first name or sort of a last name so let's implement that display function 31:16.670 --> 31:18.910 and play option. 31:19.580 --> 31:22.580 So here we will 31:25.130 --> 31:29.500 we should again check to see if we have anything in the first place. 31:30.070 --> 31:31.440 Let's do that. 31:31.700 --> 31:33.560 Read up on daks 31:36.760 --> 31:38.950 size. 31:39.040 --> 31:43.330 If you're less than or equal to zero then just return right. 31:48.340 --> 31:50.410 Turn immediately say 31:53.710 --> 31:57.060 you got it. 31:57.160 --> 32:01.310 It's that way. 32:03.140 --> 32:12.030 But if we do have contacts we shifted out to the user whether or how you want to sort it. 32:12.330 --> 32:13.200 So 32:25.440 --> 32:32.700 but if we do have contacts we shared with the user how they want to sort it. 32:32.720 --> 32:34.830 So let's give them two options. 32:34.880 --> 32:44.840 Current star search options and options will be by first name. 32:44.940 --> 32:47.180 After this one and all for this one 32:49.950 --> 32:54.600 last name in the for option 32:59.280 --> 33:04.880 in we'll say option to get character 33:07.790 --> 33:11.010 these shoes. 33:11.290 --> 33:14.020 Or at option 33:16.570 --> 33:20.570 two new lines for first name 33:24.620 --> 33:33.750 or 0 for last. 33:34.120 --> 33:35.910 It's her choice 33:40.900 --> 33:42.520 put error string 33:45.310 --> 33:48.940 and sort options options 33:51.490 --> 33:55.270 and two and we'll say it's 34:03.430 --> 34:06.520 an check to see what option we got. 34:06.700 --> 34:13.530 The option is it's a search or this should be sort of option. 34:13.530 --> 34:13.850 Sorry 34:19.610 --> 34:28.060 if the option you got is the first one that's first name since its first name. 34:30.830 --> 34:33.820 And we'll sort it by the first 34:37.210 --> 34:43.470 so contacts the bead contacts again. 34:47.230 --> 34:52.810 Contacts Heebee dot contacts dot and. 34:53.680 --> 35:04.730 But we need a we need an actual function that wants to do the comparison and we don't have that yet. 35:04.870 --> 35:11.210 So let's just write the two cases first. 35:11.390 --> 35:12.330 Copy this 35:19.580 --> 35:23.650 in lets just right now kind of. 35:23.650 --> 35:24.570 We don't have it yet. 35:24.740 --> 35:29.840 We'll here will say compare first name 35:32.750 --> 35:53.730 and here you will say hair lasting OK and let's define these functions here let's declare them at least. 35:53.970 --> 35:59.590 Compare first name and it always returns a boolean. 35:59.610 --> 36:09.180 It always takes in the actual type that the vector holds. 36:09.180 --> 36:14.370 So in this case though it will be a contes RAF contact 36:17.630 --> 36:21.500 which is called C one and constant contact 36:24.380 --> 36:29.510 is to notice that these are passed by that Vout. 36:45.890 --> 36:51.370 So identical and actually implement them down here 36:54.920 --> 37:04.840 and actually implement them kind of below or display functions so close together. 37:05.150 --> 37:13.830 So strings actually are able to be compared with the greater than or less than sine. 37:13.850 --> 37:17.860 So that's kind of one nice thing. 37:18.170 --> 37:30.240 Well it doesn't really say which order to sort them so we'll just say see one dot first name. 37:30.320 --> 37:34.810 It's less than c to dot first. 37:36.050 --> 37:40.070 OK so you can actually compare them and it'll actually do what you think it should. 37:40.070 --> 37:45.710 So in this case we're sorting them in ascending order. 37:45.710 --> 37:47.390 And what does that mean for strings. 37:47.390 --> 37:52.130 Well a will be first then be its center. 37:52.190 --> 37:53.160 OK. 37:53.270 --> 37:57.070 And will do the exact same thing for last 38:07.790 --> 38:21.300 like so there is one less thing we have to do and that is to change the display option to pass the context 38:21.300 --> 38:25.620 D-B not by Konst reference but just by reference. 38:25.920 --> 38:32.480 And that is because we're changing the contact's order right. 38:32.610 --> 38:36.920 So if we change it then we can't pass it by conc reference. 38:37.100 --> 38:39.420 Change that. 38:39.600 --> 38:43.550 So leave it in this one right here. 38:45.480 --> 38:48.590 So and now if you run it 38:52.170 --> 38:57.870 in which display first name the only one so far. 38:57.870 --> 38:59.650 So let's add back in Fred 39:02.520 --> 39:18.290 Stone and one of splay last name we should see read the first and Barni the second read first or second. 39:19.110 --> 39:22.800 And -- niblets add some more 39:25.360 --> 39:40.640 stone shows the same number as Fred and let's add Beddie double She is the same as party. 39:40.640 --> 39:49.980 So we just again in stoupe my last name. 39:50.040 --> 39:56.170 Was by first name and we will see Barney Betty Fred. 39:56.320 --> 39:56.720 All right. 39:56.770 --> 40:00.570 So it's in the proper order. 40:00.660 --> 40:04.890 So that's it for this project. 40:05.790 --> 40:16.950 In the next section we'll be dealing with a new library so that it can so that we can draw our output 40:17.160 --> 40:20.490 in a different way than what we've been using. 40:20.730 --> 40:23.910 So far so far we've only ever really used 40:26.500 --> 40:29.440 see out for output. 40:29.760 --> 40:38.860 But in our game in the next year in the last section we'll be using a different way to output to the 40:38.860 --> 40:44.660 console that will be much better suited for games in general. 40:44.950 --> 40:47.270 So I will see you in the next section.