为什么这个编译会报错

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#include <stdio.h>

#define LOWER 0 /* lower limit of table */
#define UPPER 300 /* upper limit */
#define STEP 20 /* step size */
/* print Fahrenheit-Celsius table */

int main()
{
        int fahr;
        for (fahr = LOWER; fahr <= UPPER; fahr = fahr + STEP)
                printf("%3d %6.1f\n", fahr, (5.0/9.0)*(fahr-32));
        return 0;
}