只是为了不无聊

#include <stdio.h>
main ()
{
float fahr, celsius;
int upper, lower, step;
lower = 0;
upper = 300;
step = 20;
printf("fahr celsius\n");
fahr = lower;
while (fahr <= upper);
{
celsius = 5.0 / 9.0 * (fahr - 32.0);
printf("%3.0f %6.1f\n",fahr, celsius);
fahr =fahr +step;
}
}