ansi_c_pg28_ch01_ex15.c

/*
 * Exercise 1.15.
 * Rewrite the temperature conversion program of Section 1.2
 * to use a function for conversion.
 */

#include <stdio.h>

float fahr2cels(float fahr) {
	return (5.0/9.0) * (fahr-32.0);
}

main() {
	float fahr;
	float lower, upper, step;
	lower = 0;	/* lower limit of temperatuire scale */
	upper = 300;    /* upper limit */
	step = 20;	/* step size */

	fahr = lower;

	/* print the header */
	printf("%3s %7s\n", "Farh", "Celsius");

	while (fahr <= upper) {
		printf("%3.0f %6.1f\n", fahr, fahr2cels(fahr));
		fahr = fahr + step;
	}
}