# include <stdio.h>

//
//  Program 8.11, Stephen Kochan, Programming in C.
//
int main ( void );
void multiplyBy2 ( float array[], int n );

int main ( void )
{
  float floatVals[4] = { 1.2, -3.7, 6.2, 8.55 };
  int i;
 
  multiplyBy2 ( floatVals, 4 );

  for ( i = 0; i < 4; i++ )
  {
    printf ( "%.2f  ", floatVals[i] );
  }
  printf ( "\n" );

  return 0;
}

void multiplyBy2 ( float array[], int n )
{
  int i;

  for ( i = 0; i < n; i++ )
  {
    array[i] = 2.0 * array[i];
  }

  return;
}