#include <stdio.h>

double fahrenheit_temperature(double celcius_temp){
  return (9.0 / 5.0) * celcius_temp + 32.0;
}

int main(void){

  printf("Freezing point: %6.2f F.\n", 
         fahrenheit_temperature(0.0));

  printf("Boiling point: %6.2f F.\n",
         fahrenheit_temperature(100.0));
  
  return 0;
}