C Program to Add Two Numbers Using a Pointer

In this article, you will learn and get code for adding two numbers in C using a pointer. So the question is, "Write a program in C that adds any two numbers entered by the user (at run-time) using pointers."

Addition using the pointer in C

To add two numbers using a pointer in C programming, you have to ask the user to enter any two numbers, then perform the operation using a pointer as shown here in the following program. Let's take a look at the program first, and then I will explain it further.

#include<stdio.h>
#include<conio.h>
int main()
{
    int num1, num2, sum;
    int *ptr1, *ptr2;
    printf("Enter any two Number: ");
    scanf("%d%d", &num1, &num2);
    ptr1 = &num1;
    ptr2 = &num2;
    sum = *ptr1 + *ptr2;
    printf("\nSum of %d and %d is %d", *ptr1, *ptr2, sum);
    getch();
    return 0;
}

This program was written in the Code::Blocks IDE. Here is the initial snapshot of the sample run:

c program to add two numbers using pointer

Now supply any two numbers as input, say 10 and 20, and press the ENTER key to see the output as shown here in the snapshot given below:

add two numbers using pointer c

In the above program, there are two important operators. The & (ampersand) and * (asterisk) operators. The & represents the operator's address, and the * represents the operator's value.

Program Explained

Using the address of the (&) operator, we initialized the address of the first number to the first pointer and the address of the second number to the second pointer. And then, we have added the two numbers using the value at address (*) operator and initialized it to the variable sum. Finally, as an addition result, I printed the sum value.

Here is another program that provides you with a full understanding of pointers after watching its output carefully. Let's take a look at the program:

#include<stdio.h>
#include<conio.h>
int main()
{
    int num1, num2, sum;
    int *ptr1, *ptr2;
    printf("Enter any two Number: ");
    scanf("%d%d", &num1, &num2);
    printf("\nAddress of %d is %p", num1, &num1);
    printf("\nAddress of %d is %p", num2, &num2);
    ptr1 = &num1;
    ptr2 = &num2;
    printf("\n\nptr1 = %p", ptr1);
    printf("\nptr2 = %p", ptr2);
    printf("\n\nValue at %p is %d", ptr1, *ptr1);
    printf("\nValue at %p is %d", ptr2, *ptr2);
    sum = *ptr1 + *ptr2;
    printf("\n\nSum of %d and %d is %d", *ptr1, *ptr2, sum);
    getch();
    return 0;
}

The output of the above program is shown in the snapshot given below:

c add two number using pointer

The format specifier %p is used for the standard notation of memory's address.

The same program in different languages

C Quiz


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