Question 3b 
 
Tony Keets has to determine how many of his fellow students regularly use public transport. The C++ program 
below is supposed to input the data (Y indicates public transport, N indicates private transport, X indicates the end of 
the data) and display the result. 
 
// How many students use public transport  
#include <iostream> 
using namespace std; 
 
int main( ) 
{ 
  char answer; 
  int numPublic; 
 
// initialize  
  numPublic = 0; 
  cout << "First student: Do you normally use public transport? " << endl; 
  cout << "Answer Y (for yes), N (for no), X (for end of input)" << endl; 
  cin >> answer; 
// loop  
  while (answer != 'X') 
  { 
     if (answer == 'Y')              // public transport or not?  
       numPublic++; 
  }                       // end of while loop  
// results  
  cout << "Number of students using public transport is "; 
  cout << numPublic << endl; 
 
  return 0; 
}