WEBVTT 0 00:00.650 --> 00:00.840 Yeah. 1 00:00.840 --> 00:05.000 This is the start of a new section in the section you'll be learning about conditional statements. 2 00:05.010 --> 00:06.860 We learn what our conditional statement. 3 00:06.990 --> 00:10.490 What are the ways of writing them and will use them in various programs. 4 00:10.500 --> 00:13.430 So we'll will see a lot of examples up on conditional statements. 5 00:14.430 --> 00:16.590 So let us start with the conditional statement. 6 00:16.590 --> 00:18.660 What is a conditional statement. 7 00:18.670 --> 00:23.550 see in daily life we come across conditional processing at various places. 8 00:23.550 --> 00:29.710 For example if you're logging on any website then you have to give your user I.D. and password. 9 00:29.910 --> 00:32.890 If it is a valid then you are allowed to enter in. 10 00:33.090 --> 00:34.380 Otherwise you have not allowed. 11 00:34.770 --> 00:42.720 So if-else second one for example if suppose there is a sale going on in any shop then if you make a bill 12 00:42.780 --> 00:46.480 of some amount let us say thousand bucks then you will get a discount. 13 00:46.510 --> 00:48.040 Otherwise no discount. 14 00:48.060 --> 00:50.750 So if Bill is more 1000 then you'll get a discount. 15 00:50.770 --> 00:51.830 Otherwise no discount. 16 00:52.260 --> 00:55.350 So normal Billing will be done. 17 00:55.830 --> 01:02.190 If you got marks that are passing marks that is greater than this much then you are pass. 18 01:02.190 --> 01:08.010 Otherwise you are fail so like this there are many places where we use is and else conditional statement. 19 01:08.160 --> 01:11.380 So the same thing in computation views condition statement. 20 01:11.970 --> 01:16.950 So let us see how to write a conditional statement in C++ and how they work. 21 01:17.080 --> 01:23.840 See this is a skeleton of C++ conditional statement if and this is the condition. 22 01:23.890 --> 01:26.000 And this is block of if flower bracket. 23 01:26.040 --> 01:29.490 Else block of else, if this condition given here. 24 01:29.490 --> 01:38.350 If it is true then this block will be executed, if it is a false then this block will be executed. 25 01:38.430 --> 01:44.960 So depending on the result of the condition if block is executed or else block is executed. 26 01:45.000 --> 01:48.720 how to write condition we will see afterwards now the same thing. 27 01:48.720 --> 01:56.100 The flow off of this one is shown here using a piece of flowchart right so flowchart is here like starting 28 01:56.100 --> 01:57.170 and ending point leave it. 29 01:57.300 --> 01:59.040 Only the part that is dealing with. 30 01:59.280 --> 02:01.640 If a conditional statement has shown here. 31 02:02.040 --> 02:08.040 This is used for checking the condition if the condition is true then this block of statements will 32 02:08.040 --> 02:08.770 be executed. 33 02:08.790 --> 02:14.760 Then it will continue further if the condition is false then it will branch into this direction and 34 02:14.760 --> 02:17.720 it will execute this block and then continue further. 35 02:17.940 --> 02:19.920 So the rest of the processing is common. 36 02:19.920 --> 02:27.630 This is a conditional if true this one else false that one, so this showing the flow off control in case 37 02:27.630 --> 02:36.640 of if and else. so this is the syntax of conditional statement and here writing if and then else, else is optional. 38 02:36.690 --> 02:37.340 ... 39 02:37.470 --> 02:40.210 If you want to write else write it or other wise you can write if 40 02:40.260 --> 02:42.650 If also. else nothing 41 02:42.930 --> 02:44.560 So this is optional. 42 02:44.630 --> 02:44.930 Now 43 02:44.930 --> 02:47.920 Next thing we will learn what is this true and false. 44 02:47.920 --> 02:50.220 Then after that I'll show you condition. 45 02:50.220 --> 02:51.360 True and False. 46 02:51.360 --> 03:01.070 see In C++ programming false means zero false means zero and true any other value is true. 47 03:01.110 --> 03:09.080 So usually we say that one means true actually not just one any other number any other number numeric 48 03:09.090 --> 03:12.590 right, integer type not floating point integer type. 49 03:12.720 --> 03:18.090 Any other value is treated as true only it will check it for the zero and false otherwise true. 50 03:18.120 --> 03:22.590 So it means instead of one if I write ten then also it is true minus 10. 51 03:22.590 --> 03:24.280 Then also true minus 2. 52 03:24.300 --> 03:27.760 Then also true what is the no. you take it is true. 53 03:27.750 --> 03:36.830 So even you can write true and false like this are also you can use 0 and 1 in C++. 54 03:37.030 --> 03:43.440 Now next thing we will learn how to write on this condition ambitions are written using a relational 55 03:43.510 --> 03:47.100 operate does relational operators. 56 03:47.130 --> 03:48.880 So what are relational operators. 57 03:48.990 --> 03:54.570 Less than less than equal to greater than greater than equal to equal to. 58 03:54.670 --> 04:02.730 So for equal to we have this symbol double assignments symbol and not exclamation equal to not 59 04:02.730 --> 04:03.710 equal to. 60 04:03.750 --> 04:06.040 These are relational operators. 61 04:06.090 --> 04:14.280 We write conditional statements using relational operators and also logical operators so logical operators. 62 04:14.280 --> 04:15.770 I would not show them now. 63 04:15.810 --> 04:20.440 I will cover them in another video. now what this relational operator are? 64 04:20.600 --> 04:25.210 These are used for comparing the values on either side. 65 04:25.250 --> 04:35.840 See for example if I write a less than B suppose the value of a is 10 and the value of b is 15 then 66 04:35.840 --> 04:37.450 what will be the result of this. 67 04:37.490 --> 04:41.660 A less than B yes a is less than b so it is true. 68 04:41.930 --> 04:46.190 So this gives the result true or false. 69 04:46.190 --> 04:53.180 So it gives actually true or false means 1 or 0 it will not give any other number but it gives one or 70 04:53.180 --> 04:56.870 zero. all these operators gives the result 71 04:57.290 --> 05:00.920 Either true or false, right see, 72 05:00.950 --> 05:12.030 Suppose I have a as 15 and b as 15 if I write it as a is equals to B then what is the result. 73 05:12.230 --> 05:13.670 The result is true. 74 05:13.810 --> 05:18.130 And if I say a is not equal to B then what is the result. 75 05:18.230 --> 05:21.720 Actually they are equal so the result is false means. 76 05:21.830 --> 05:24.670 This is one and this is zero. 77 05:24.680 --> 05:32.150 If I say it a is less than or equal to B if it is not less but it is equal so the result is true. 78 05:32.690 --> 05:35.310 So this is how it gives the result. 79 05:35.600 --> 05:40.550 So remember the important point the relational operators give their result either in true or false that 80 05:40.550 --> 05:44.770 is 1 or 0 , 0 or 1. 81 05:44.810 --> 05:49.580 More about this how to use them we will write down the example programs and we will learn more about this 82 05:49.580 --> 05:50.100 one. 83 05:50.150 --> 05:54.050 So this video was just the introduction to conditional statements. 84 05:54.140 --> 05:59.200 So the next video we will write on the program using this conditional statement and relational operators.