WEBVTT 00:00.680 --> 00:07.010 We've been using libraries this whole time to help us write our programs I stream is the one we use 00:07.010 --> 00:15.400 the most libraries provide us with functionality that we can use that other performers have created. 00:15.400 --> 00:22.610 They are mainly a convenience and true in terms of the time it takes to write our programs and to help 00:22.670 --> 00:25.210 ease the process of writing programs. 00:25.250 --> 00:31.110 Things would be a lot harder and more frustrating if we didn't have access to already built library 00:31.120 --> 00:40.770 libraries we've made our own libraries with utils utilize the e-tail site H and CVP that we've created 00:40.770 --> 00:43.430 that does a lot of our input. 00:43.500 --> 00:52.470 For example and we've seen how to use them by using the Include statement. 00:52.760 --> 00:59.180 So you may have noticed that sometimes we use double quotes around the name and sometimes we use these 00:59.180 --> 01:02.470 kind of angle triangle brackets. 01:02.480 --> 01:10.640 The difference is the location of where the preprocessor searches for that file in double quotes it 01:10.650 --> 01:15.430 searches in the same directory as a file containing the Include statement. 01:15.720 --> 01:24.260 This is usually for programmers defined headers like are you utilities in the triangles of brackets. 01:24.330 --> 01:28.980 It will search in an implementation dependent manner. 01:28.980 --> 01:33.650 For example the directories predesignated by the compiler. 01:33.810 --> 01:39.260 These are usually the standard library headers reviews for example. 01:39.310 --> 01:52.570 These types E-string see Maff and so on these plus standard library will be the theme of this section. 01:52.580 --> 02:01.100 It's really just a large group of functions and objects that are written in the core language and part 02:01.100 --> 02:04.770 of the C++ ISO standard. 02:04.810 --> 02:10.990 It also includes many headers of the iso's standard. 02:11.050 --> 02:14.680 We're not going to go through all of them. 02:14.800 --> 02:19.170 I just want to go over the most appropriate for this course. 02:19.180 --> 02:27.820 If you want to take a look at everything you can go to this site and that will show you basically everything 02:27.820 --> 02:31.320 that the C++ standard library has to offer. 02:31.660 --> 02:36.070 And there's a lot in there and it's a very very deep topic. 02:36.400 --> 02:41.090 But I want to at least give you a little bit of exposure. 02:41.200 --> 02:49.690 So in the next two to three lectures I briefly go over some of the more useful libraries and show you 02:49.690 --> 02:51.910 how to use them. 02:51.930 --> 02:54.960 You go into that much detail though. 02:55.020 --> 03:03.160 Again this is very deep topic but it's important to learn and over the course of your studies you should 03:03.160 --> 03:05.760 really dive deeper into it.