Solution: Fahrenheit to Celsius

#include <stdio.h>
double degF_to_degC(double degF)
{
  double degC;
  degC = (degF - 32.0) / 1.8;
  return degC; 
}
int main()
{
    printf("%f\n", degF_to_degC(4.3));
    return 0;
}