# C Program to Add Two Numbers Using Call by Reference2 min read

The program takes the two numbers from the user and passes the reference to the function where the sum is calculated. You may go through the topic below.

Output:

`Enter the first number: 15.5Enter the Second number: 20.5Sum of the result: 36.000000`

This is a simple C program that demonstrates the use of a user-defined function to add two floating-point numbers. Let’s break down the code:

Function Declaration:

• This line declares a function named `addFunc` that takes two float pointers (`a` and `b`) as parameters and returns a float value.

Function Definition:

• Inside the `addFunc` function, it calculates the sum of the values pointed to by `a` and `b` and returns the result.

Main Function:

• The `main` function is the entry point of the program.
• It declares three float variables `num1`, `num2`, and `result`.
• It takes user input for `num1` and `num2` using `scanf`.
• Calls the `addFunc` function, passing the addresses of `num1` and `num2`.
• Prints the result.

Execution:

• The program prompts the user to enter two floating-point numbers.
• It then calculates the sum of these numbers using the `addFunc` function.
• Finally, it prints the result to the console.

So, if the user enters, for example, `5.3` and `2.7`, the program would output:

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