C++ The Return Keyword
Return Values
The void keyword, used in the previous examples, indicates that the
function should not return a value. If you
want the function to return a value, you can use a data type (such as int,
string, etc.) instead of void, and use the return
keyword inside the function:
Example
int myFunction(int x) {
return 5
+ x;
}
int main() {
cout << myFunction(3);
return 0;
}
// Outputs
8 (5 + 3)
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This example returns the sum of a function with two parameters:
Example
int myFunction(int x, int y) {
return x + y;
}
int main()
{
cout << myFunction(5, 3);
return 0;
}
// Outputs 8 (5 + 3)
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You can also store the result in a variable:
Example
int myFunction(int x, int y) {
return x + y;
}
int main() {
int z = myFunction(5, 3);
cout << z;
return 0;
}
// Outputs 8 (5 + 3)
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Pratical Example
Here is a simple and fun "game example" using a function with return
to double a number five times:
Example
int doubleGame(int x) {
return x * 2;
}
int main() {
for (int i = 1; i <= 5; i++)
{
cout << "Double of " << i << " is " <<
doubleGame(i) <<
endl;
}
return 0;
}
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