/* -------------------------------------------------------------------------- 
**  Chapter 15, Using the Computer Exercise 1:  Files.
** -------------------------------------------------------------------------- 
*/
#include "tools.h"   
                           
#define x_init 0.0                             
#define x_final 1.0                            

double f( double x ){ return pow( x, 3 ) - pow( x, 2 ) - 3 * x + 12 ; }
                              
/* -------------------------------------------------------------------------- */
void main ( void )                                       
{   
    double x, y;
                                   
    /* Delete the #defines for x_init and x_final.                            */
    /* Declare x_init and x_final as int variables.                           */
    /* Declare an integer variable for the error code returned by fscanf().   */  
    /* Declare streams for your input and output files.                       */ 
  
    banner();                              
   /* Open your input and output files.  Exit if either statement faiils.     */
   /* Read values from your input file for x_init and x_final.                */
   /* Exit with an appropriate message if there is a read error.              */ 

   /* Change the next line to use your output stream instead of stdout.       */ 
    printf( "\n     x              y \n\n" );

    for (x = x_init; x <= x_final; x += 0.1 ) {                              
        y = f( x );
        /* Change the next line to use your output stream instead of stdout. */ 
        printf( "%8.2f %15.2f \n", x, y );
    }                                                   
    /* Close your streams. */
    bye();
}