Switch Case - C++ Tutorial For Beginners #10

Key Takeaways

it's not a game it's [Music] a what is going on guys welcome back to the C++ tutorial Series in today's video we're going to talk about switch case statements so let us get right into it so the switch case statement is just an additional decision making structure in C++ so in the last video we talked about if lse and what happens when we do if else statements so first of all we have if then some condition in the parenthesis above and if that condition is true so it's a Boolean value in the end so whatever we write in there a comparison a function whatever it is if it returns a Boolean value it can be put into that par into those parentheses there if the return value of that is true we're going to execute this block of code here otherwise we're going to go into the else block and of course we can also have else if with other conditions and so on we already talked about that in the last video and now we're going to introduce switch case statements and for those of you who only code in python or or half only coded in Python you probably don't know about about switch case statements because they're not supported in Python and how they work is you have to pass either an integer or a character so a Char to that switch case structure and then you can Define cases for the value so let me show you what I mean by that let's say we have uh some integer I don't know X and it has a certain value or actually let's let's uh say it's a user input what we can then do is we can say switch X and then we can just specify certain cases for example one case could be X is 8 and if x is 8 we use a colon here and you we use indentation here um if the case 8 happens so if the case 8 is uh the case that we have right now so if the value of x is 8 then we can do something for example I don't know C out of the value was eight or something and then we can break so we always need to end a case with a break because otherwise if we don't uh end the case with a break it's just going to continue into the next case and we can specify a bunch of cases here like 10 for example and we can say something else here I don't know do the action for input 10 just have to Define whatever we want to do here and when we're done with a code we specify a break statement again and then we can also specify I so-called default statement which is essentially if the input was not8 and was not 10 and not one of the other case options that we can Define here we're going to go to the default value which is something like everything else essentially and we can define an action here stuff like uh invalid input for example and then we can break this as well so now when we run this you can see what this does and we can enter something like zero for example it says invalid input we can enter eight and we get the value is eight and we can also enter 10 do the action for input 10 now in this case this is not really useful so we're going to change this right now into a simple calculator we're going to build a simple calculator here we're going to say int n one and two for number one number two and then we are going to say character operator and now we're going to say see out enter the first number and this is it then we're going to say enter the second number and in between we're going to say choose an arithmetic operation and of course we're going to ask for the inputs respectively there you [Music] go and then we can go ahead and say switch and we can pass the operator so switch op case one the operator that was specified is the addition operator if that is the case we're going to return uh N1 + N2 break and we can now copy this here for all the individual operators so we can say for minus for subtraction for [Music] multiplication for division last but not least then also for the modulus operator so for the remainder and don't confuse this with a percentage operation by the way and otherwise if we get something else and those five operators we're going to say operator not support it there you go break all right so this is theault structure here and it should work already so let's try it enter the first number let's say I want to say 22 * 88 and this is the result then let's do something else let's say six modulus or modulo uh four we get two as a result then I can say 88 divided by five and of course maybe it makes a little bit more sense to make this a float so that we can do division properly let's recompile this uh what do we have here oh okay we cannot use the modulus operation here but we can typ cast this into an integer here if we're calling the modulus operation and then it should work so now I can go ahead and say 88 divided by 7 for example oh sorry this was not the right thing 88 divided by 7 and you can see that we got a floating Point result at the same time I can do the modulus operation so I can say um 17 modulus 3 and I get two and I can also go ahead and say 17.65 modulus 3.89 but what's actually happening since I'm typ casting is 17 modulus 3 so I'm getting the same result here as you can see this is how you can do a simple calculator uh and of course you can do this with if else statements as well so you can just say if operator equals equals plus then do this otherwise else if if it equals this but this is just more convenient uh for the switch variable you can only use characters and integers you cannot use anything else you cannot use floats doubles or more complex objects or structures um but as you can see this is a way more convenient way to to go through the different options so that's it for today's video hope you enjoyed it I hope you learned something if so let me know by hitting a like button and leaving a comment in the comment section down below and of course make sure you subscribe to this Channel and you hit the notification Bell to not miss a single future video for free other than that thank you very much for watching see you in the next video and bye [Music]