C program to convert a temperature from Fahrenheit to Celsius

Simple C program that converts a temperature from Fahrenheit to Celsius, along with an explanation of each part of the program:

#include <stdio.h>

int main() {
    // Declare variables
    double fahrenheit, celsius;

    // Ask the user to enter the temperature in Fahrenheit
    printf("Enter the temperature in Fahrenheit: ");
    scanf("%lf", &fahrenheit);

    // Convert Fahrenheit to Celsius using the formula: (F - 32) * 5/9
    celsius = (fahrenheit - 32) * 5.0 / 9.0;

    // Display the converted temperature in Celsius
    printf("The temperature in Celsius is: %.2lf degrees Celsius\n", celsius);

    return 0;
}

Here’s a breakdown of the program:

1. We include the stdio.h header for input and output functions.
2. We declare two variables: fahrenheit (to store the temperature in Fahrenheit) and celsius (to store the converted temperature in Celsius).
3. We use printf to ask the user to enter the temperature in Fahrenheit and scanf to read the input and store it in the fahrenheit variable.
4. We convert the temperature from Fahrenheit to Celsius using the formula: (F - 32) * 5/9, where F is the temperature in Fahrenheit.
5. Finally, we use printf to display the converted temperature in Celsius with two decimal places.

To run this program, follow these steps:

1. Open a C compiler (like GCC) on your computer.
2. Copy and paste the program into a new C file (e.g., temp_conversion.c).
3. Compile the program by running gcc temp_conversion.c -o temp_conversion in the command prompt or terminal.
4. Run the program by typing ./temp_conversion and providing the temperature in Fahrenheit when prompted.

The program will then calculate and display the temperature in Celsius based on the Fahrenheit input you provide.