Switch Case

[Mrbluee]

Can someone please provide me with an example of a switch case and what switch case does?

 

switch (day)
{
case 1 : cout << "Sunday";
break;
case 2 : cout << "Monday";
break;
case 3 : cout << "Tuesday";
break;
case 4 : cout << "Wednesday";
break;
case 5 : cout << "Thursday";
break;
case 6 : cout << "Friday";
break;
case 7 : cout << "Saturday";
break;
default : cout << "Not an allowable day number";
break;
}

 

Is this one?

[athos]

looks fine, tho the variable DAY needs to be filled with something to work properly

 

Generally speaking its just another way to produce a if... else clause, wich can

get confusing depending on how many if and else commands you have

[Satlen]

Basically if the numeric data (an integer) in the variable day is equal to 1, it is going to display sunday, if it is 2, it will display monday, and so on. If a number other than 1-7 is entered, it defaults the the default statement which in this case displays a message. The breaks make it so only of the cases is executed. You do not want to execute more than one case because that would ruin the point. Also, you can do switches with string variables too.

[Midnight]

Also, you can do switches with string variables too.

 

Incorrect (mostly). It depends on the language and you certainly cannot do switches with strings in C++.

[Satlen]

Incorrect (mostly). It depends on the language and you certainly cannot do switches with strings in C++.

Well I know you can do it in C# which is what I thought this was in but have not seen what a switch looks like in other languages. 

[madknight3]

Here's a tutorial page (switch is at the bottom) http://www.cplusplus.com/doc/tutorial/control/

And another one http://www.tutorialspoint.com/cplusplus/cpp_switch_statement.htm

 

A switch statement is kind of like another way to write an if statement.

switch (day){    case 1:        cout << "Sunday";        break;    case 2:        cout << "Monday";        break;    // ...    default:        cout << "Not an allowable day number";        break;}// basically the same asif (day == 1) {    cout << "Sunday";}else if (day == 2) {    cout << "Monday";}// ...else { // the default switch case    cout << "Not an allowable day number";}

The compiler may or may not treat them the same. Switch will be just as fast or faster than if statements though (source) however that doesn't mean you can use switch statements in every case.

[madknight3]

Well I know you can do it in C# which is what I thought this was in but have not seen what a switch looks like in other languages. 

The cout << is what indicates that it's C++. The C++ switch statement uses the same syntax as C# and Java (and I'm sure other languages as well)

[Satlen]

The cout << is what indicates that it's C++. The C++ switch statement uses the same syntax as C# and Java (and I'm sure other languages as well)

oh yeah, true! didnt catch that my bad.

[KuroSetsuna29]

The breaks make it so only of the cases is executed. You do not want to execute more than one case because that would ruin the point.

 

Fall through in case statements can actually be useful.

If you leave out a break then it will run the code in the following case statement, and continue until a break is found.