call by value and call by reference

// program to illustrate call by value as well as call by reference

#include<iostream>
#include<conio.h>

void passbyvalue(int x);
void passbyreference(int *x);
void main()
{
   int a=13;
   int b=13;

   passbyvalue(a);  /// call by value

   passbyreference(&b);   call by address
   cout<<a<<endl;
   cout<<b<<endl;

   getch();
}
void passbyvalue(int x)
{
x=33;
}
void passbyreference(int *x)
{
*x=99;
}

Output