Error 1: Here function prototype is missing.
Error 2: no need for variable z.
Error 3: no need of the statement z = x*y;
#include<iostream>
using namespace std;
int multi(int, int);
int main ()
{
int x,y;
cin>>x>>y;
cout<<multi(x,y);
cout<<multi(int a, int b)
{
return a*b;
}