C++ Function Parameter Passing value to Functions

#include <iostream> 

using namespace std; 

void f(int myparam) 
{ 
    myparam += 10; /* www . j av a  2  s.c o  m*/
    cout << "Inside the function:" << endl; 
    cout << myparam << endl; 
} 

int main() 
{ 
  int mynumber = 30; 
  cout << "Before the function:" << endl; 
  cout << mynumber << endl; 

  f(mynumber); 
  cout << "After the function:" << endl; 
  cout << mynumber << endl; 

  return 0; 
}