Code:
#includ<stdio.h>
int x,y;
void eqn(int a,int b)
{
x=a+b;
y=a-b;
}
main()
{
int t,r,p,q;
scanf("%i%i");
eqn(t,r);
p=x;
q=y;
printf("%i,%i",p,q);
}