#include<stdio.h>

/*当fahr = 0，20，...,300时，打印华氏温度与摄氏温度对照表；浮点数版本。*/

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

	lower = 0;			/*温度的下限*/
	upper = 300;		/*温度的上限*/
	step = 20;			/*步长*/

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