Inline function:
It is a function without prototype. The function is defined above main. The function should be declared above main function.
Declaring the function as inline will increase the performance, but it is usually used for small functions. It reduces the memory requirement. Inline function must have return statement in the function at the same it need not have return type. All other function sub program or must definition and prototype.
inline int f_ref(int x, int y)
{ return (x+y); // Inline function can return statement without return type.
}
void main( )
{
int a, b;
f_ref(a, b);