Write a C program to swap first and last digits of a number

Swap first and last digits of a number

Sample Output

Swap first and last digits of a number.

Number: 122334

Swapped Number: 422331

Source Code

#include<stdio.h>

int main()
{
    int digit, number, revNumber = 0;
    int swappedNumber, temp, firstDigit, lastDigit;

    printf("Swap first and last digits of a number.\n\nNumber: ");
    scanf("%d", &number);

    /** Reverse Number */
    lastDigit = number % 10;
    while(number >= 10)
    {
        digit = (number % 10);
        number = (number / 10);
        revNumber = (10 * revNumber) + digit;
    }
    firstDigit = number;
    digit = (number % 10);
    revNumber = ((10 * revNumber) + digit);
    number = revNumber;
    /** Reverse number end  */

    /** Again reverse the number but ignore first and last digits */
    swappedNumber = lastDigit; /// Ignore first digits, it swapped!

    number = number / 10;
    while(number >= 10)
    {
        digit = (number % 10);
        number = number / 10;
        swappedNumber = ((10 * swappedNumber) + digit);
    }
    swappedNumber = ((10 * swappedNumber) + firstDigit); /// Ignore last digits, it swapped!.
    printf("\nSwapped Number: %d\n\n", swappedNumber);
}

Sample Output

Swap first and last digits of a number.

Number: 192

Swapped Number: 291