SOURCE FILE: EX0304.CPP

//   
// Example 3.4. Demonstration of how a function cannot change   
// the contents of a pass by value parameter
//    
   
#include <iostream.h>
   
int main(void)   
{   
   void modify_i(int i);  // prototype local to main 
   int i;                 // local to main   
   
   i = 1;                 // local variable is assigned 1 
   cout << "Before calling modify_i, i equals " << i << endl;   
   modify_i(i);   
   cout << "After  calling modify_i, i equals " << i << endl;   

   return 0;
}   
   
//   
// Function to modify parameter i locally 
// Pre:  i is an integer.   
// Post: none   
//    
   
void modify_i(int i)    // i is local to modify_i  
{   
   i = 3;               // parameter is assigned 3 
}