Program to add two number in C

C Program to add two numbers:

By Ahmad Irshad | Programming Exercises and Solutions > Addition of two numbers

Write a C Program to add two numbers by taking input from user. Have a look at the below example and step by step logic to add two numbers.

Before writing any program you just imagine about output screen first. Like what input to be given, and output to be displayed. Let's have a look at the below example.

1. INPUT
2. 
   
3. Enter first number: 10
4. Enter second number: 20
   

  OUTPUT

Sum of 10 and 20 = 30

Required knowledge for this exercise is: 

Basic Input output, Data Type, Arithmetic operators 

Logic to add two numbers:

1) Print a massage to the user like "Enter two numbers:" using printf();

2) Input number from user and store it in a variables num1 & num2 using scanf();

3) Calculate sum of two numbers using farmula sum = num1 + num2;

4) At last print the value of sum. that's it! 

Program to find sum of two numbers input givien by a user : 

1. /** * C program to find sum of two numbers */ #include <stdio.h> int main() { int num1, num2, sum; /* * Read two numbers from user */ printf("Enter first number: "); scanf("%d", &num1); printf("Enter second number:"); scanf("%d", &num2); /* Adding both number is simple and fundamental */ sum = num1 + num2; /* Prints the sum of two numbers */ printf("Sum of %d and %d = %d", num1, num2, sum); return 0; }

Output:

1. Enter first number: 10
2. Enter second number: 20
3. sum of 10 and 20 is = 30

You can take input separately for each number by using scanf(). 

For Example:

1. /* Read first number from user */ printf("Enter first number: "); scanf("%d", &num1);
2. /* Read second number from user */ printf("Enter second number:"); scanf("%d", &num2);

OR

Above statements can also write like this:

1. /* Read two numbers from user */ printf("Enter first number: "); scanf("%d%d", &num1, &num2);
   

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