1.3 for语句

#include<stdio.h>
int main()
{
    int fahr;
    for (fahr = 0;  fahr<= 300; fahr=fahr+20)
    {
        printf("%3d %6.1f\n", fahr, (5.0 / 9.0)*(fahr - 32.0));
    }
    return 0;
}