/*
*
* 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 :
 C Program to calculate sum of two hardcoded numbers
 C Program to Add two floating values
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