Celsius <-> Fahrenheit

#include<stdio.h>
double celsiustofahrenheit(double c)
{
    return (((9*c)/5)+32);
}
double fahrenheittocelsius(double f)
{
    return (((f-32)*5)/9);
}

int main()
{
    char g;
    double c,f;
    scanf("%c",&g);
    if(g=='f' || g=='F'){
          scanf("%lf",&f);
          printf("Celsius = %.4lf\n",fahrenheittocelsius(f));
    }
    else{
          scanf("%lf",&c);
          printf("Fahrenheit = %.4lf\n",celsiustofahrenheit(c));
    }
}