# include <stdio.h>

//
//  Program 8.7, Stephen Kochan, Programming in C.
//
int main ( void );
float absoluteValue ( float x );

int main ( void )
{
  float f1 = -15.5, f2 = 20.0, f3 = -5.0;
  int i1 = -716;
  float result;

  result = absoluteValue ( f1 );
  printf ( "result = %.2f\n", result );
  printf ( "f1 = %.2f\n", f1 );

  result = absoluteValue ( f2 ) + absoluteValue ( f3 );
  printf ( "result = %.2f\n", result );

  result = absoluteValue ( ( float ) i1 );
  printf ( "result = %.2f\n", result );

  result = absoluteValue ( i1 );
  printf ( "result = %.2f\n", result );

  printf ( "%.2f\n", absoluteValue ( ( - 6.0 ) / 4 ) );

  return 0;
}

float absoluteValue ( float x )
{
  if ( x < 0 )
  {
    x = -x;
  }
  return x;
}