Write a C program to Swap two numbers using pointers

By | 29.11.2016

Swap two numbers using pointers


Write a C program to Swap two numbers using pointers. Here’s simple program to Swap two numbers using pointers in C Programming Language.


What are Pointers?


A pointer is a variable whose value is the address of another variable, i.e., direct address of the memory location. Like any variable or constant, you must declare a pointer before using it to store any variable address.

The general form of a pointer variable declaration is

  • type *var-name;

Here, type is the pointer’s base type; it must be a valid C data type and var-name is the name of the pointer variable.

The asterisk * used to declare a pointer is the same asterisk used for multiplication. However, in this statement the asterisk is being used to designate a variable as a pointer.

The unary or monadic operator & gives the “address of a variable’”.

The indirection or dereference operator * gives the “contents of an object pointed to by a pointer”.


Below is the source code for C program to Swap two numbers using pointers which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/*  C program to Swap two numbers using pointers  */

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

int main()
{
    int num1,num2;
    int *a,*b,*temp;

    printf("Enter 1st number :: ");
    scanf("%d",&num1);
    printf("\nEnter 2nd number :: ");
    scanf("%d",&num2);

    a=&num1;
    b=&num2;

    printf("\nBefore Swapping ::\n\n\ta = %d\tb = %d\n",*a,*b);

    temp=a;
    a=b;
    b=temp;

    printf("\nAfter Swapping ::\n\n\ta = %d\tb = %d\n",*a,*b);

    return 0;
}

Output  : :


/*  C program to Swap two numbers using pointers  */

Enter 1st number :: 5

Enter 2nd number :: 9

Before Swapping ::

        a = 5   b = 9

After Swapping ::

        a = 9   b = 5

Process returned 0

Above is the source code for C program to Swap two numbers using pointers which is successfully compiled and run on Windows System.The Output of the program is shown above .

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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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KSHL

The above program is wrong.

Correct logic is:

*temp=*a;
*a=*b;
*b=*temp;