# Find Sum of two numbers

This is a simple C program that calculates the sum of two numbers entered by the user.

Variables :

integers : num1 and num2 to hold values of number A and number B.

sum is used to store the value of A + B

Functions:

printf(): is used to disply text and values on the console/screen. %d in printf function is used to display a int variable on screen. \n is used to add a new line

scanf(): is used to fetch data inputted by the user on the console/screen using the keyboard. %d in scanf is indicated that inputted text is of type int. &num1 refers to the address of memory location which will hold number1

Description: Plus + is the addition operator used to add two numbers. sum variable holds the sum of num1 and num2.

``````/*
*
* 1000+ C programs + tutorials
* This is a C program to calculate
* sum of two numbers.
* 1_calculate_sum_of_two_numbers.c
* Created on: Oct 20, 2019
* Author: Code2care.org
*/

#include <stdio.h>
//#include <conio.h>

void main() {

int num1;
int num2;
int sum;

//clrscr();

printf("Program to calculate Sum of two numbers :  \n\n");

printf("Enter value of 1st number : ");
scanf("%d", &num1);

printf("\n\nEnter value of 2st number : ");
scanf("%d", &num2);

sum = num1 + num2;

printf("\n\n Sum of %d + %d = %d", num1, num2, sum);

//getch();

}``````
Output:
``````Program to calculate the sum of two numbers :
Enter the value of 1st number: 2
Enter the value of 2nd number: 4
Sum of 2 + 4 = 6``````

If you do not want a 3rd variable sum then we can simply output the sum as,

printf("\n\n Sum of %d + %d = %d", numberA, numberB, numberA+numberB);

``````/*
*
* 1000+ C programs + tutorials
*
* Sum of two numbers without using third variable
*
*
*
* 1_calculate_sum_of_two_numbers.c
*
*  Created on: Oct 20, 2014
*  Author: Code2care.org
*/

#include <stdio.h>
//#include <conio.h>

void main() {

int numberA;
int numberB;

//clrscr();

printf("C Program to calculate Sum of two numbers :  \n\n");

printf("Enter value of number A : ");
scanf("%d", &numberA);

printf("\n\nEnter value of number B : ");
scanf("%d", &numberB);

printf("\n\n Sum of %d + %d = %d", numberA, numberB, numberA+numberB);

//getch();

}``````
Output:
``````C Program to calculate Sum of two numbers :
Enter value of number A : 10
Enter value of number B : 40
Sum of 10 + 40 = 50``````
Adding 3 numbers entered by user.

printf("\n\n Sum of %d + %d = %d", numberA, numberB, numberA+numberB+numberC);

``````/*
*
* 1000+ C programs + tutorials
*
* Sum of two numbers without using third variable
*
*
*
* 1_calculate_sum_of_two_numbers.c
*
*  Created on: Oct 20, 2014
*  Author: Code2care.org
*/

#include <stdio.h>
//#include <conio.h>

void main() {

int numberA;
int numberB;
int numberC;

//clrscr();

printf("C Program to calculate Sum of two numbers :  \n\n");

printf("Enter value of number A : ");
scanf("%d", &numberA);

printf("\n\nEnter value of number B : ");
scanf("%d", &numberB);

printf("\n\nEnter value of number C : ");
scanf("%d", &numberC);

printf("\n\n Sum of %d + %d + %d = %d", numberA, numberB,numberC numberA+numberB+numberC);

//getch();

}``````
Output:
``````C Program to calculate Sum of two numbers :
Enter value of number A : 10
Enter value of number B : 40
Enter value of number B : 50
Sum of 10 + 40 + 50 = 100``````
Similar Question : 1. C Program to calculate sum of two hardcoded numbers 2. C Program to Add two floating values Hashtags: #cProgramming #SumOfNumbers

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