Please help with C programming! How can I convert this code to a function? I nee

Question

Please help with C programming! How can I convert this code to a function? I need to have a function prototype above main, a function call inside of main, and then have the function definition below main. I achieved the same result without using a function which was to create a program that converts temperatures between Fahrenheit and Celsius and prints the resulting value to the screen. However, that apparently didn't suffice and I really don't know what to do. Any assistance would be greatly appreciated!

#include

int main() //Main program
{
int fahr,cel,selection; //Declaration of variables

printf("Enter a 1 to convert a Fahrenheit number to Celsius, or enter a 2 to convert a Celsius number to Fahrenheit. "); //User prompt
scanf("%d",&selection); //Read selection

//Displays the Celsius equivalent of the Fahrenheit temperature entered
if(selection==1)
{
printf("Enter the number to be converted ");
scanf("%d",&fahr);
cel=(5.0/9.0 * (fahr-32));
printf("%d degrees Fahrenheit is %d degrees Celsius ",fahr,cel);

}

//Displays the Fahrenheit equivalent of the Celsius temperature entered
if(selection==2)
{
printf("Enter the number to be converted ");
scanf("%d",&cel);
fahr=(9.0/5.0 * cel+32);
printf("%d degrees Celsius is %d degrees Fahrenheit ",cel,fahr);
}

} //End main

Explanation / Answer

I have created two functions for the above program, one for conversion from celsius to fahrenheit and the other from fahrenheit to celsius. I have specified function declaration, function call, and function definition in the comments. In addition, I have modified the values of temperature from int to float in order to get the correct values.

Modified program:

#include<stdio.h>
void Fah_to_Cel(); //function declaration
void Cel_to_Fah(); //function declaration
float fahr,cel; //global declaration of the required variables so that they are available to all functions in the program
  
int main() //Main program
  {
   int selection; //Declaration of variables
   printf(" 1. Convert temperature from Fahrenheit to Celsius ");
   printf(" 2. Convert temperature from Celsius to Fahrenheit ");
   printf(" Enter your choice "); //User prompt
   scanf("%d",&selection); //Read selection

  //Displays the Celsius equivalent of the Fahrenheit temperature entered
   if(selection==1)
   {
    Fah_to_Cel(); //Function call
  }

  //Displays the Fahrenheit equivalent of the Celsius temperature entered
   else if(selection==2)
   {
    Cel_to_Fah(); //Function call
   }
   
   else
   {
       printf("Invalid option ");
  }

} //End main

void Fah_to_Cel() //Function definition
{
  
  printf("Enter the number to be converted ");
   scanf("%f",&fahr);
   cel=(5.0/9.0) * (fahr-32);
   printf("%f degrees Fahrenheit is %f degrees Celsius ",fahr,cel);
}

void Cel_to_Fah() //Function definition
{
printf("Enter the number to be converted ");
  scanf("%f",&cel);
  fahr=(9.0/5.0)* (cel+32);
  printf("%f degrees Celsius is %f degrees Fahrenheit ",cel,fahr);
  }

Output:

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