K&R 演習1-5 - うらでぃみーる通信 @Wiki

#include <stdio.h>

int main()
{
    int fahr;

    for(fahr = 300; fahr >= 0; fahr = fahr - 20)
        printf("%3d %6.1f\n", fahr, (5.0/9.0)*(fahr-32));
    return 0;
}