int sum (int a, int b){
// declarations and statements if any
return a+b;
}Functions must be declared before they are used. or use C++ Forward Declaration Every function will be allocated onto the Heap:
- A address space for every parameter (pointer or actual data)
- A address space for every variable
- An address space for the function
Argument behavior
- Arguments are treated like a list
- In the memory, they will be null terminated
Default return type of ‘int’
All c functions have an assumed return type of int unless you specify otherwise.
myfuncion (){
}Return null
int haha (){
return; // return nothing at all
}void return
Sometimes you just dont intend to return at all. make the return type void then
void manipulator(int &balls){
(balls)++;
} Return types are always typecasted
int dtoi(double mynum){
return mynum;
}They will typecast if the typecast makes sense
Function impossibilities
- it is impossible for a function to take on infinite arguments. better to use a struct or array