if double, 104 --> -17.778 not 40.000

and then CE 

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    double a;
    while(scanf("%lf",&a)==1)
    {                        
    printf("%.3lf\n",(a-32)/9*5);
    }
    return 0;
    
}

我少標一個了, sor