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assignment-s-10.c

Problem Statement

Write a program to swap two numbers using pointers (user-defined function).

Metadata

Property Detail
Author Amit Dutta (amitdutta4255@gmail.com)
License MIT
Difficulty Beginner (index: 2 / 10)

Concepts

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  • Recursion
  • Pointers

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Source Code

#include <stdio.h>

void swap(int *, int *);

int main()
{
    int a, b;
    printf("Enter value for a and b: ");
    scanf("%d %d", &a, &b);
    printf("\nBefore Swap: ");
    printf("\na = %d,\tAddress: %u", a, &a);
    printf("\nb = %d,\tAddress: %u", b, &b);
    swap(&a, &b);
    printf("\nAfter Swap: ");
    printf("\na = %d,\tAddress: %u", a, &a);
    printf("\nb = %d,\tAddress: %u", b, &b);
    return 0;
}

void swap(int *a, int *b)
{
    *a = *a ^ *b;
    *b = *a ^ *b;
    *a = *a ^ *b;
}

Explanation

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    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (assignment-s-10.c):

    #include <stdio.h>

    void swap(int *, int *);

    int main()
    {
        int a, b;
        printf("Enter value for a and b: ");
        scanf("%d %d", &a, &b);
        printf("\nBefore Swap: ");
        printf("\na = %d,\tAddress: %u", a, &a);
        printf("\nb = %d,\tAddress: %u", b, &b);
        swap(&a, &b);
        printf("\nAfter Swap: ");
        printf("\na = %d,\tAddress: %u", a, &a);
        printf("\nb = %d,\tAddress: %u", b, &b);
        return 0;
    }

    void swap(int *a, int *b)
    {
        *a = *a ^ *b;
        *b = *a ^ *b;
        *a = *a ^ *b;
    }