luc107.c

Problem Statement

luc107.c

Receive an unsigned 16-bit integer and exchange the contents of its 2 bytes using bitwise operators.

Source Code

#include <stdio.h>
#include <stdlib.h>

int main()
{
    unsigned short num, swapped;

    printf("Enter a 16-bit number (0-65535): ");
    scanf("%hu", &num);

    // Exchange bytes:
    // 1. (num & 0xFF00) >> 8 : Move High Byte to Low Byte position
    // 2. (num & 0x00FF) << 8 : Move Low Byte to High Byte position
    
    swapped = ((num & 0xFF00) >> 8) | ((num & 0x00FF) << 8);

    printf("Original: %hu (Hex: 0x%04X)\n", num, num);
    printf("Swapped:  %hu (Hex: 0x%04X)\n", swapped, swapped);

    return 0;
}

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● Author - Amit Dutta · Updated - 08 Feb 2026