1-5.c

#include <stdio.h>

/* print Fahrenheit-Celsius table
   for fahr = 0, 20, ..., 300; floating-point version */

int main(){
	float fahr, celsius;
	int lower, upper, step;

	lower = 0;	/* lower limit of temperature table */
	upper = 300;	/* upper limit */
	step = 20;	/* step size */

	fahr = upper;

	printf("F    C\n");
	printf("==========\n");

	while(fahr >= lower){
		celsius = (5.0/9.0) * (fahr-32.0);
		printf("%3.0f %6.1f\n", fahr, celsius);
		fahr = fahr - step;
	}

	return 0;
}