Function in C and C++ Qus 2

 #include<stdio.h>

#include<conio.h>

#include<iostream.h>

int sum(int a,int b);

int sub(int a,int b);

int main()

{

clrscr();

cout<<sum(6,3)<<endl;

cout<<sub(6,3)<<endl;

int s=sum(9,5);

cout<<s<<endl;

getch();

return 0;

}

int sum(int a,int b)

{

cout<<"Sum="<<a+b<<endl;

return a+b,a*b;

}

int sub(int a,int b)

{

return a-b;

}