Please help ! :(

[babyybabyy]

Error at cout<<duplicate(x, y, z);

error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'void' (or there is no acceptable conversion)

#include<iostream>
using namespace std;
#include<string>

int add(int i, int y){
int b;
 b=i+y;
return b;
}

void duplicate (int& a, int& b, int& c)
{
  a*=2;
  b*=2;
  c*=2;
}

int main ()
{
  int x=5, y=7, z=5;


  cout<< add(x, y)<<endl; // passing by value //value will be a copy of x in



  cout<<duplicate(x, y, z)<<endl;




  return 0;

  
}

[TarikNeaj]

Look at the difference between your first function and the second. Ask yourself, Why does this work

 cout<< add(x, y)<<endl;

but not this

cout<<duplicate(x, y, z)<<endl;

[babyybabyy]

OHHHH I GET U !