/*---------------------------------------------------*/
/*  Program chapter4_9                               */
/*                                                   */
/*  This program converts a temperature in           */
/*  Fahrenheit to Centigrade.                        */

#include <stdio.h>
#define degrees_C(x) ((x) - 32.0)*(5.0/9.0)

int main(void)
{

   /*  Declare variables.  */
   double temp;

   /*  Get temperature in Fahrenheit.  */
   printf("Enter temperature in degrees Fahrenheit: \n");
   scanf("%lf",&temp);

   /*  Convert and print temperature in Centigrade.  */
   printf("%f degrees Centigrade \n",degrees_C(temp));

   /*  Exit program.  */
   return 0;
}
/*---------------------------------------------------*/