前两个是WA，求教

#include<stdio.h>
int main(void)
{
    double m=0,h=0, BIM=0;
    scanf("%lf %lf", &m, &h);
    BIM = m/(h * h);
    if (BIM < 18.5)
        printf("Underweight");
    else 
        if (BIM >= 18.5 && BIM < 24)
            printf("Normal");
        else
            printf("%lf\nOverweight",BIM);
    return 0;
}