Program to Sum of Two Numbers in C using a Function

Program Description:

Write a program to Sum of Two Numbers in C using a Function. This program is to understand how functions work in c language.

The program accepts two numbers from the user and calculates the sum of those numbers. The program should create a function, which should accept two numbers as input and return the integer number ( which is the sum of given numbers).

Example Input and Output:

Input:

Enter two numbers : 10 20

Output:

Sum of 10 and 20 is : 30

Pre-Requisites:

• C Functions
• Arithmetic Operators in C Language

Sum of two Numbers in C using Function Program Explanation:

1. Accept two numbers from the user as input, And store them in variables number1 and number2 respectively.
2. We are going to create a function called sum.
   • The sum function takes two variables as input number1 and number2 and calculate the sum of number1 and number2 and returns the result.
   • Here number1 and number2 are formal arguments of the sum function.
   • As the sum function is defined after the function call, So we need to declare the function using the function declaration. We have added the sum function declaration at the start of the program using int <strong>sum</strong>(int, int);
3. Call the sum function by passing the number1 and number2 from the main function. As the sum function returns an integer which is the sum of the given numbers, Assign the function call to an integer variable (i.e result). So that the return value of the sum function will be stored in result variable
   • result = <strong>sum</strong>(number1, number2);
4. Print the result on the console using printf function.

Sum of two Numbers in C using function Program:

Here is the sum of two numbers program using functions in the C programming language

The sum function prototype details.

function_name: sum

argument_list: (int, int)

return_type: int

Sum of two Numbers in C Program Output:

We are using the GCC compiler to compile and run the program.

Run the program and provide two integer values.

Let’s try a few more examples

As we can see from the above output, We are getting the expected results.

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