# include <stdio.h>

//
//  Program 5.5, Stephen Kochan, Programming in C.
//

int main ( void )
{
  int n, number, triangularNumber, counter;

  for ( counter = 1; counter <= 5; counter++ )
  {
    printf ( "What triangular number do you want?  " );
    scanf ( "%i", &number );

    triangularNumber = 0;
    for ( n = 1; n <= number; n++ )
    {
      triangularNumber = triangularNumber + n;
    }
    printf ( "Triangular number %i is %i\n\n", number, triangularNumber );
  }

  return 0;
}