WEBVTT 00:00.920 --> 00:08.240 We're at the end of this section so that means we should be doing some practice now and in the next 00:08.240 --> 00:14.130 lecture there'll be some practice problems for you to do alone. 00:14.210 --> 00:21.220 So I hope you do these practice problems because the more you practice the better you'll get at it. 00:21.350 --> 00:28.840 And if you're always just following someone else you'll really solidify what you've been learning. 00:29.180 --> 00:32.850 So let's start with Problem 1 here. 00:32.960 --> 00:40.090 It says right now a that takes the temperature in Fahrenheit and outputs it in Celsius. 00:40.100 --> 00:45.220 So it's kind of like what we had before except for the reverse. 00:45.230 --> 00:50.290 Before we add Celsius to Fahrenheit now we're having Fahrenheit to Celsius. 00:50.470 --> 01:02.410 So let's have a variable called Loach Celsius and reason float because since we have to divide something 01:02.930 --> 01:10.690 if you remember your formula for Fahrenheit to Celsius as I'm sure you all do you have to actually divide 01:11.680 --> 01:19.790 some numbers so we're going use float so we can have better precision. 01:19.860 --> 01:23.500 So then in hi it's 01:26.890 --> 01:28.210 in touch. 01:28.240 --> 01:30.290 So say see out 01:32.840 --> 01:40.590 please enter the Fahrenheit. 01:45.800 --> 01:47.550 See in the Fahrenheit 01:51.810 --> 01:54.280 and then calculate the Celsius 01:58.060 --> 01:59.770 Celsius is 02:02.490 --> 02:09.460 at night which minus 30 to times. 02:09.460 --> 02:22.790 Thirty two point to Earth 5.0 and we use five point oh here and this should make sure that everything's 02:22.790 --> 02:26.120 all in floating point number numbers. 02:28.700 --> 02:32.780 9.00 that's the formula. 02:33.080 --> 02:34.550 And we'll just put it. 02:34.650 --> 02:37.300 See Ouch. 02:37.360 --> 02:38.790 We'll see if Fahrenheit. 02:38.820 --> 02:39.270 Ch 02:42.140 --> 02:46.810 in Celsius is 02:50.240 --> 02:51.280 Celsius. 02:55.910 --> 03:00.270 And so we're on it. 03:04.180 --> 03:05.670 And stay 03:09.200 --> 03:10.190 hopper here. 03:15.630 --> 03:16.380 We're on 03:20.420 --> 03:34.540 say 70 should be about 21 degrees Celsius and that's it for this one. 03:34.630 --> 03:38.320 So the next one actually we're going to 03:41.950 --> 03:54.200 comment every line so you can do it. 03:54.230 --> 03:55.090 The next problem 03:58.450 --> 04:03.810 write a program that takes three numbers and prints the average So we need three numbers. 04:03.810 --> 04:07.760 All Again we'll use float here use integer if you really want. 04:07.770 --> 04:15.290 But just for precision sake use float 3. 04:15.500 --> 04:24.760 So we have three C out say please enter three numbers 04:27.180 --> 04:35.960 paraded Speace. 04:36.160 --> 04:39.220 Rules change in all. 04:39.990 --> 04:44.420 One two in three 04:47.690 --> 05:02.100 and safe Loach average is one plus two plus three. 05:02.200 --> 05:06.280 Nice room using parentheses here just like we did in the last problem. 05:06.280 --> 05:12.990 Just to make sure that everything gets done in the proper order. 05:13.040 --> 05:14.430 C Ouch. 05:17.790 --> 05:19.380 The average 05:21.650 --> 05:25.410 is in print. 05:25.440 --> 05:26.160 The average 05:37.310 --> 05:38.830 is like are Kirkley 05:45.380 --> 05:46.830 it's kind of weird sometimes. 05:48.130 --> 05:48.640 You know 05:51.330 --> 05:53.830 32 Phi. 05:53.870 --> 05:57.680 He didn't five say so. 05:57.730 --> 06:02.430 The average is 15. 06:02.590 --> 06:06.200 That's it in comment. 06:06.300 --> 06:07.270 Ouch. 06:09.250 --> 06:09.970 And 06:13.380 --> 06:22.090 it's gone the next problem is kind of interesting and it'll it'll kind of use something that we went 06:22.090 --> 06:34.210 over in the types lecture so it says write a program that takes in a character and outputs its ascii 06:34.210 --> 06:35.230 value. 06:35.580 --> 06:44.390 So sure you all looked at the table the ASCII table so you all know what the ascii values are now. 06:44.500 --> 07:00.710 So let's first get the actual character input so say see out leads enter a character 07:04.830 --> 07:12.490 that's seat in the character input. 07:14.140 --> 07:16.870 And let's let's do let's do it like this. 07:16.900 --> 07:21.490 Let's say we have an int and we'll call it value and we're going to sign it. 07:21.490 --> 07:27.460 The char input and remember what I said that it's. 07:27.460 --> 07:34.770 It can be sometimes dangerous to do this but in fact this happens actually quite a bit. 07:34.810 --> 07:37.350 This is what's called casting. 07:37.810 --> 07:45.660 So we're casting this char input into which is a char into a integer. 07:45.790 --> 07:51.970 And this is actually OK here because the int is much bigger than a char. 07:52.060 --> 07:58.790 So in in essence we're never going to be losing any information. 07:58.840 --> 08:05.800 For example if we had some kind of Intan then or a double at say and cast that to a float we might lose 08:05.800 --> 08:07.020 precision. 08:07.030 --> 08:12.320 In fact we probably will lose precision but in this case this is acceptable. 08:12.310 --> 08:18.110 So let's just output seek out ch 08:22.760 --> 08:23.980 s e 08:31.150 --> 08:32.900 value. 08:35.420 --> 08:37.260 Our input. 08:40.170 --> 08:40.950 Is 08:44.180 --> 08:47.070 now in 08:57.720 --> 09:00.990 it's run. 09:03.240 --> 09:06.970 I don't understand why Eclipse does sometimes. 09:07.690 --> 09:10.770 So enter Charlotte S. capital A. 09:11.200 --> 09:15.190 So you ask the value of A is 65. 09:15.370 --> 09:22.560 So if you look up the ASCII table right now and you can actually check yourself and it is indeed 65 09:22.570 --> 09:25.850 so you can even read this again and see. 09:25.850 --> 09:30.580 So if he entered B it should be 66 ranked it is. 09:30.670 --> 09:33.600 So this is working correctly. 09:33.640 --> 09:41.290 So just a few examples of problems that he could come across later on. 09:41.290 --> 09:44.370 In fact we'll come across much much more difficult problems. 09:44.380 --> 09:51.160 But I want to start you off nice and easy trying to get you familiar with the syntax and how things 09:51.160 --> 09:52.380 are really working. 09:52.840 --> 10:00.700 And I hope you'll do the next lecture which is a an article of just more problems to solve and I hope 10:00.700 --> 10:09.110 you will take the time and figure them out and try them in in Eclipse and run them and see what kind 10:09.110 --> 10:10.960 of output you can get. 10:10.970 --> 10:12.960 So I'll see you in the next section.