what is 'double' used for?

[OKIEWARDOYO]

look at this functon

double substract(int num1, int num2){
 return num1 + num2;
}

what is double used for on that function?
thanks

[Michael37]

To return a variable of type double.

Do you know what type double is? it is a floating point type, but with more digits of precision.

[ui uiho]

the function you posted has no need to be a double. change it to int

int + int = int