int pro(int n1,int n2);
void main()
{
int n1,n2;
clrscr();
printf("enter the numbers:\t");
scanf("%d%d",&n1,&n2);
printf("\nthe product is %d",pro(n1,n2));
getch();
}
int pro(int n1,int n2)
{
if(n2==0) return 0;
else return n1+pro(n1,n2-1);
}