화씨,섭시 변경

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
 
 
    double Fah, Cel;
 
    double fahToCel(double Cel);
    double celToFah(double Fah);
    int main() {
 
        char ask;
 
        printf("If you want to change Fah to Cel enter F ,and if you want to change Cel to Fah enter C\n");
 
        while (1) {
 
            scanf("%c", &ask);
            if (ask == 'F') {
 
 
                printf("Enter Degree: ");
                scanf("%lf", &Fah);
                printf("Fah to Cel result is %lf to %lf degree\n", Fah, fahToCel(Fah));
                break;
            }
            else if (ask == 'C') {
 
                printf("Enter Degree: ");
                scanf("%lf", &Cel);
                printf("Cel to Fah result is %lf to %lf degree\n", Cel, celToFah(Cel));
                break;
            }
            else {
 
                printf("Error case enter again :\n");
                scanf("%c", &ask);
            }
        }
    }
 
 
double celToFah(double Cel) {
    double Fah = 1.8 * Cel + 32;
    return Fah;
}
 
double fahToCel(double Fah) {
    
    double Cel = (Fah - 32) / 1.8;
    return Cel;
}