Swap the first and last digits of a number with C.

 

Swap the first and last digits of a number with C.

#include <stdio.h>

#include <math.h>

int main()

{

int num, swappedNum;

int firstDigit, lastDigit, digits;

printf("Enter any number: ");

scanf("%d", &num);

lastDigit  = num % 10;

digits     = (int) log10(num);

firstDigit = (int) (num / pow(10, digits));

swappedNum  = lastDigit;

swappedNum *= (int) round(pow(10, digits));

swappedNum += num % ((int)round(pow(10, digits)));

 swappedNum -= lastDigit;

 swappedNum += firstDigit;

printf("Original number = %d", num);

printf("Number after swapping first and last digit: %d", swappedNum);

    return 0;

}

Output:-

Enter any number: 456798

Original number = 456798

The number after swapping first and last digit: 856794