text: // Program 5.4
  
  #include<stdio.h>
  
  int main( void )
  {
  
      int n, number, triangularNumber;
  
      printf( "What triangular number do you want? " );
      scanf( "%i", &number );
  
      triangularNumber = 0;
  
      for( n = 1; n <= number; ++n )
  	triangularNumber += n;
  
      printf( "Triangular number %i is %i\n", number, triangularNumber );
  
      return 0;
  
  }
  