1 00:00:01,420 --> 00:00:04,860 Hi everyone welcome to the first lesson in the upcoming videos. 2 00:00:04,870 --> 00:00:07,550 I will teach you programming in C++ language. 3 00:00:07,630 --> 00:00:12,000 I will try my best to cover all that topic from beginner to the expert level. 4 00:00:12,010 --> 00:00:17,860 After finishing this course you will become proficient in C++ and being proficient in C++ never was 5 00:00:18,000 --> 00:00:19,350 out-of-state and demand. 6 00:00:19,360 --> 00:00:22,830 So let us get started in today's class. 7 00:00:22,840 --> 00:00:24,880 We will be learning some basics of programming. 8 00:00:24,880 --> 00:00:28,810 So first of all we should answer what does a computer do. 9 00:00:28,810 --> 00:00:33,540 So you give input to the computer and the computer will generate the corresponding output. 10 00:00:33,850 --> 00:00:37,740 So have you ever talked about how computer will understand our instructions. 11 00:00:37,900 --> 00:00:41,520 We human can communicate to each other because we speak the same language. 12 00:00:41,530 --> 00:00:44,620 For example English but there's a problem with the computer. 13 00:00:44,680 --> 00:00:48,090 It is an electronic machine and it doesn't understand English. 14 00:00:48,100 --> 00:00:55,690 It only understand binary and binary is basically 0 and 1 0 means you can see my switches off and one 15 00:00:55,690 --> 00:00:58,100 means I can see my switches on. 16 00:00:58,150 --> 00:01:05,560 In other words what begins a zero means false and one means through so if you want to communicate directly 17 00:01:05,560 --> 00:01:07,760 to a computer you need to talk in binary. 18 00:01:07,780 --> 00:01:12,870 So first of all let us discuss what is binary so binary is actually an ambush system. 19 00:01:12,880 --> 00:01:14,350 We have many in my system. 20 00:01:14,410 --> 00:01:17,470 So let us talk about number systems. 21 00:01:17,470 --> 00:01:20,560 So now let us talk about number systems. 22 00:01:20,710 --> 00:01:26,680 So number system can be categorized into two types rated number system and unweighted number system. 23 00:01:27,040 --> 00:01:33,280 So the examples of could number system are basically the decimal number system by the number system 24 00:01:33,760 --> 00:01:36,760 octane number system and hexadecimal number system. 25 00:01:36,850 --> 00:01:38,150 There can be many mode. 26 00:01:38,260 --> 00:01:42,340 The example of unweighted number system is basically telling them what system. 27 00:01:42,340 --> 00:01:46,590 So let us discuss first and rigid number system what this and region number system. 28 00:01:46,660 --> 00:01:52,480 So in and we didn't in my system each digit will have the same read each digit has been assigned the 29 00:01:52,480 --> 00:01:53,140 same read. 30 00:01:53,170 --> 00:01:54,310 Consider this example. 31 00:01:54,310 --> 00:01:59,320 So this digit is assigned a very tough one this digit has also a very tough one. 32 00:01:59,350 --> 00:02:01,980 And this is also has been assigned a very tough one. 33 00:02:01,990 --> 00:02:03,100 Now let us talk about. 34 00:02:03,100 --> 00:02:05,940 We did it in my system saying we did it in my system. 35 00:02:05,950 --> 00:02:10,270 Each digit has been assigned some weight and weights will be different for different in my system. 36 00:02:10,300 --> 00:02:12,790 So let us talk about decimal in my system. 37 00:02:12,820 --> 00:02:18,930 We use decimal and the system in our day to day life in this decimal in my system 2 to 5 is not close 38 00:02:18,940 --> 00:02:20,200 to 225. 39 00:02:20,200 --> 00:02:21,590 They are different. 40 00:02:21,590 --> 00:02:22,980 Older digital same. 41 00:02:22,990 --> 00:02:24,540 We have to then we have three. 42 00:02:24,550 --> 00:02:25,670 Then we have five. 43 00:02:25,690 --> 00:02:28,810 Similarly we have two three and five digits are same. 44 00:02:28,840 --> 00:02:30,280 But the values are different. 45 00:02:30,280 --> 00:02:31,740 The views are different here. 46 00:02:31,780 --> 00:02:36,070 Digit 5 has a very tough one digit 3 has a rate of 10. 47 00:02:36,190 --> 00:02:39,480 And digital basically has a vote of hundred and here. 48 00:02:39,490 --> 00:02:46,630 District 5 has a rate of one digit 2 has a vote of 10 and digital digitally basically has a vote of 49 00:02:46,630 --> 00:02:47,020 hundred. 50 00:02:47,110 --> 00:02:52,600 So basically if you will do like this what will do digit multiply makes corresponding with it and we 51 00:02:52,600 --> 00:03:00,290 will add similarly we will multiply digit with its corresponding weight so three will be multiplied 52 00:03:00,290 --> 00:03:06,320 by hundred two times hundred then two times ten and five times one and these two values are different 53 00:03:07,280 --> 00:03:08,960 these two values will be different. 54 00:03:08,990 --> 00:03:11,120 So we struggled in my system here. 55 00:03:11,120 --> 00:03:14,450 We will learn more about my system deeply in our future classes. 56 00:03:14,510 --> 00:03:19,580 So I was telling you that if you want to communicate directly to a computer you need to talk in binary 57 00:03:19,640 --> 00:03:22,910 but it is impossible for us to talk or write in binary. 58 00:03:22,940 --> 00:03:28,290 So we use programming languages alongside with the food charts and algorithms for solving a problem. 59 00:03:28,310 --> 00:03:31,200 So let us take the help of our diagram. 60 00:03:31,300 --> 00:03:33,460 So this is a beautiful diagram. 61 00:03:33,580 --> 00:03:34,840 So what do we have here. 62 00:03:34,990 --> 00:03:36,130 So I have a problem. 63 00:03:36,130 --> 00:03:39,830 So what we will do so this problem will be passed through an algorithm. 64 00:03:39,850 --> 00:03:45,530 Okay so what is any one of them algorithm is basically a procedure for solving a problem. 65 00:03:45,550 --> 00:03:49,710 So we have many steps to solve the problem step one then we will perform step two. 66 00:03:49,720 --> 00:03:54,470 And similarly there will be many more steps then what we do we will take the help of flowchart. 67 00:03:54,490 --> 00:04:01,090 So what is flowchart flowchart is basically a pictorial representation or you can see the magnetic representation 68 00:04:01,090 --> 00:04:06,010 off and you go to them pictorial or magnetic representation off and then go out of them. 69 00:04:06,550 --> 00:04:07,880 So include chart. 70 00:04:07,900 --> 00:04:10,670 We will be having many shapes like oval shape. 71 00:04:10,690 --> 00:04:12,160 We can have below ground shape. 72 00:04:12,160 --> 00:04:13,540 We can have rectangle shape. 73 00:04:13,540 --> 00:04:19,510 We can have diamond shape and so on and then we will be having our programming languages so be it stands 74 00:04:19,510 --> 00:04:20,980 for programming languages. 75 00:04:20,980 --> 00:04:22,900 So we have many programming languages. 76 00:04:22,900 --> 00:04:26,340 For example we can have C++ which will start in discos. 77 00:04:26,350 --> 00:04:27,870 It can be Java. 78 00:04:27,940 --> 00:04:29,890 It can be python and many more. 79 00:04:30,070 --> 00:04:31,890 So we have many programming languages. 80 00:04:31,930 --> 00:04:34,000 And finally we will get our solution. 81 00:04:34,000 --> 00:04:38,920 Now let us discuss what is a programming language before discussing what is programming language. 82 00:04:38,920 --> 00:04:40,630 Why do we need programming language. 83 00:04:40,630 --> 00:04:43,480 Let us try to understand what is the need of a programming language. 84 00:04:43,540 --> 00:04:48,000 So the answer is very simple computer only understand binary and we cannot talk in binary. 85 00:04:48,040 --> 00:04:50,370 So we need the help of a programming language. 86 00:04:50,380 --> 00:04:55,030 So programming language is a language with the help of which we can communicate to a computer. 87 00:04:55,030 --> 00:05:00,610 In this course we are learning C++ programming language so like any other language in general programming 88 00:05:00,610 --> 00:05:08,080 language will also have some words some symbols some rules in programming language the rules of grammar 89 00:05:08,410 --> 00:05:15,380 the grammatical rules are called syntax so I'm going to beating myself like any other language in general 90 00:05:15,380 --> 00:05:21,590 programming language will also have words symbols and rules of grammar so the rules of grammar has basically 91 00:05:21,590 --> 00:05:24,560 a name which is called syntax simple. 92 00:05:24,590 --> 00:05:27,660 No let us talk about different types of programming language. 93 00:05:27,710 --> 00:05:30,570 So there are basically two types of programming language. 94 00:05:30,710 --> 00:05:36,560 We have high level language and we have low level language and now let us try to understand the difference 95 00:05:36,560 --> 00:05:37,160 between them. 96 00:05:37,160 --> 00:05:43,670 So basically the high level language these languages are basically close to humans and low level language 97 00:05:43,760 --> 00:05:45,590 are basically close to machines. 98 00:05:45,590 --> 00:05:47,840 We can easily read and understand. 99 00:05:47,870 --> 00:05:52,790 We can easily read and write high level language but for the low level language it is impossible or 100 00:05:52,790 --> 00:05:56,810 you can say it is very difficult for us to read and write low level language. 101 00:05:56,840 --> 00:06:02,070 The examples of high level language can be C++ it can be Java. 102 00:06:02,120 --> 00:06:03,250 It can be Python. 103 00:06:03,320 --> 00:06:10,430 It can be too sharp and so on the example of low level language is basically assembly language. 104 00:06:10,430 --> 00:06:19,080 So let us understand it more clearly so we have our C++ language oriented Java or you can say bye to 105 00:06:19,100 --> 00:06:19,710 language. 106 00:06:19,770 --> 00:06:25,200 Then we have our assembly language then we have machine code which we will understand later where this 107 00:06:25,200 --> 00:06:25,820 machine code. 108 00:06:25,830 --> 00:06:31,100 And finally we are we are having something like IBM IBM and might be us. 109 00:06:31,110 --> 00:06:35,230 So this is generally a flu so. 110 00:06:35,260 --> 00:06:39,420 Now let us talk about how the high level instructions will be executed. 111 00:06:39,420 --> 00:06:42,270 We have high level instructions or what we can say. 112 00:06:42,300 --> 00:06:43,890 We can say human instructions. 113 00:06:43,890 --> 00:06:50,010 So these human instructions will pass through a magical box and this magical box will contain two things 114 00:06:50,070 --> 00:06:51,510 compiler and linker. 115 00:06:52,110 --> 00:06:56,070 So this magical boxes is containing two things compiler and linker. 116 00:06:56,160 --> 00:07:03,180 And finally our output will basically be a machine called machine code is basically zero once 0 1 0 117 00:07:03,180 --> 00:07:05,270 1 0 1 1 and so on. 118 00:07:05,280 --> 00:07:07,940 So machine code is basically zeros and ones. 119 00:07:07,950 --> 00:07:12,440 Now let us try to understand what is a compiler and what is a linker. 120 00:07:12,450 --> 00:07:18,810 So the purpose of compiler is basically it will read it will analyze it will translate our code we will 121 00:07:18,810 --> 00:07:22,690 write the code in C++ language in this course. 122 00:07:22,770 --> 00:07:28,910 So it will read analyze and translate our code to an objectified dot all will be the extension. 123 00:07:28,920 --> 00:07:31,930 And what is the purpose of Linker so Linker what will do. 124 00:07:31,950 --> 00:07:38,430 It will combine one or more object file which is generated by the compiler along with some other files 125 00:07:38,550 --> 00:07:42,360 along with some library files to make an executable file. 126 00:07:42,540 --> 00:07:45,090 Dot e x e will be the extension. 127 00:07:45,180 --> 00:07:48,300 So let us take the help of our diagram to understand it better. 128 00:07:48,300 --> 00:07:50,670 So we have this beautiful diagram with us. 129 00:07:50,670 --> 00:07:51,900 Now what do we have here. 130 00:07:51,930 --> 00:07:55,020 So we have source code so we can have many source codes. 131 00:07:55,140 --> 00:07:56,280 So this source code. 132 00:07:56,400 --> 00:07:58,890 What it will do so it will pass through a compiler. 133 00:07:58,920 --> 00:08:00,890 So I have compiler here. 134 00:08:00,930 --> 00:08:02,690 Similarly I have compiler here. 135 00:08:02,700 --> 00:08:05,380 And similarly we have compiler here. 136 00:08:05,520 --> 00:08:11,080 So this source code will pass through a compiler and the output will basically be an object code. 137 00:08:11,130 --> 00:08:13,050 So this will be the output object code. 138 00:08:13,050 --> 00:08:16,410 Dot e dot or is our extension dot or. 139 00:08:16,560 --> 00:08:21,200 And similarly dot or then here we will be having our library file. 140 00:08:21,240 --> 00:08:26,120 So we have library file or you can say library equal there is no need to worry for the local library 141 00:08:26,120 --> 00:08:26,430 code. 142 00:08:26,460 --> 00:08:29,190 We will see all these things in detail in our future lessons. 143 00:08:29,190 --> 00:08:30,750 Now what is the purpose of linker. 144 00:08:31,020 --> 00:08:33,270 So here is our link at present. 145 00:08:33,270 --> 00:08:34,470 So what Linker will do. 146 00:08:34,500 --> 00:08:42,490 So Linker will combine one or more object called along with the library file to make an executable file. 147 00:08:42,540 --> 00:08:44,420 Dot e XY will be the extension. 148 00:08:44,430 --> 00:08:47,850 So let me demonstrate to you with the help of an example during the standard better 149 00:08:50,510 --> 00:08:52,250 just focus on my screen. 150 00:08:52,250 --> 00:08:53,810 So I have this file here. 151 00:08:53,870 --> 00:08:55,250 Demo da CPB. 152 00:08:55,400 --> 00:08:57,840 CPB means C++ file. 153 00:08:58,010 --> 00:09:03,910 No let us open this file I have written some code here and there is no need for you to understand what 154 00:09:03,910 --> 00:09:05,920 is the meaning of this code. 155 00:09:05,930 --> 00:09:08,860 Now this button is basically compiler Britain. 156 00:09:08,920 --> 00:09:17,980 Now let us build and run our program so Hallowell is the output for this program no let us close our 157 00:09:17,980 --> 00:09:18,440 output. 158 00:09:18,820 --> 00:09:21,550 And now let us see our next drop screen again. 159 00:09:21,640 --> 00:09:28,600 So see these two files nematode all and Democrat XY so these two files were not present earlier but 160 00:09:28,600 --> 00:09:29,920 they are present now. 161 00:09:29,920 --> 00:09:31,980 So what is the meaning of these two files. 162 00:09:31,990 --> 00:09:39,040 So basically this dot all file this file is basically generated by the compiler and what is the purpose 163 00:09:39,040 --> 00:09:39,570 of linker. 164 00:09:39,610 --> 00:09:46,290 So Linker will combine this object code with some library code to make this dot e XY file. 165 00:09:46,480 --> 00:09:53,980 Now let us come back to our class no let us discuss the last topic for today's class and the last topic 166 00:09:54,040 --> 00:09:56,030 is basically variables. 167 00:09:56,030 --> 00:10:01,300 Now let us try to understand what is the meaning of a variables so variables are basically simply cells 168 00:10:01,300 --> 00:10:05,100 in a memory variable story information audio data. 169 00:10:05,170 --> 00:10:06,700 So let us consider this example. 170 00:10:06,700 --> 00:10:10,510 So I have written here and even come up to. 171 00:10:10,750 --> 00:10:13,450 So P1 and b to other two variables. 172 00:10:13,450 --> 00:10:18,710 So let's say the name of this cell is basically Beaven and the name of this cell in the memory lets 173 00:10:18,730 --> 00:10:25,830 say its name is basically P2 so be when and b to are variables because they are cells in the memory. 174 00:10:25,900 --> 00:10:30,620 For example if I write even a close hundred then what will happen. 175 00:10:30,670 --> 00:10:39,310 So I will store hundred in memory location even and what will happen if I do P2 equals P1 so the meaning 176 00:10:39,310 --> 00:10:44,010 of this line is very simple copy the content of P1 and to be true. 177 00:10:44,110 --> 00:10:47,780 So what will happen P2 will also store hundred just like P1. 178 00:10:47,800 --> 00:10:54,850 So basically B1 and B2 they are variables while there are variables because they have cells in the memory. 179 00:10:54,850 --> 00:11:01,920 Okay so now let us discuss what is the meaning of integer so in the mean basically integer it stands 180 00:11:01,920 --> 00:11:05,780 for integer so the meaning of descent is basically very simple. 181 00:11:05,940 --> 00:11:12,930 This entry is B1 and B2 they will store only integer there is stored only integer you can see B one 182 00:11:12,930 --> 00:11:19,470 variable is storing an integer hundred is an integer similarly B2 variable is also storing an integer 183 00:11:19,740 --> 00:11:22,190 so that is the significance of writing in period. 184 00:11:22,200 --> 00:11:27,950 So I think this is enough for introduction to programming and next class we will learn about flowchart 185 00:11:28,110 --> 00:11:29,290 in detail. 186 00:11:29,460 --> 00:11:31,490 Can't wait to see you in the next one. 187 00:11:31,500 --> 00:11:31,880 Bye bye.