Question

MUST BE DONE IN C (NOT C++)

Your create a program that can implement the cases in which the initial unit is Fahrenheit or something not recognizable. Your program should incorporate Fahrenheit to Celsius, Fahrenheit to Kelvin and unknown initial units (display an error message for this last one). You must use functions to calculate Fahrenheit degrees.

Answer 1

#include<stdio.h>
//function to convert from fahrenheit to kelvin
float FahrenheitToKelvin(float temperature)
{
    float kelvin;
    //expression to convert fahrenheit to kelvin
    kelvin = (temperature-32)*(float)5/9+273.15;
    return kelvin;//return kelvin
}
//function to convert from fahrenheit to celcius
float FahrenheitToCelcius(float temperature)
{
   float celcius;
       //expression to convert fahrenheit to celcius
   celcius = (temperature - 32)*(float)5/9;
   return celcius;//return celcius
}
//driver program
int main()
{
    //variable declarations
    float celcius,kelvin,fahrenheit;
    int opt;
    printf("\n Enter the temperature in Fahrenheit");
    scanf("%f",&fahrenheit); //read the temperature in fahrenheit
    //show the options
    printf("\n 1. Fahrenheit to Kelvin.\n 2. Fahrenheit to Celcius.");
    printf("\n Enter the choice : ");
    scanf("%d",&opt);//read the option
    //condition to call FahrenheitToKelvin(fahrenheit);
    if(opt==1)
    {
       kelvin = FahrenheitToKelvin(fahrenheit);
       printf("\n%5.1f F = %5.3f K",fahrenheit,kelvin);
       }
       else
       //condition to call FahrenheitToCelcius(fahrenheit);
       if(opt==2)
           {
       celcius = FahrenheitToCelcius(fahrenheit);
       printf("\n%5.1f F = %5.3f K",fahrenheit,celcius);
           }
           else//block for invalid choice
           printf("\n ERROR : Invalid Choice for conversion.");
   return 0;
}

output