# 1 : C Program to Find Sum of two numbers

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This is a simple C program that calculates 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 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 newline

scanf() : is used to fetch data inputted by the user on the console/screen using keyboard. %d in scanf is indicates that inputted text is of type int. &num1 referes 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, 2014
*  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 Sum of two numbers :
Enter value of 1st number : 2
Enter value of 2st 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

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