Swap first and last digit of a number

Posted on Apr 7, 2020

C program to swap first and last digit of a number.

Program

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
	int num, swap_num, temp;
    int last_digit, first_digit, count;
    int i;

    printf("Enter the number\t:");
    scanf("%d",&num);

    temp = num;
    count = 0;
    while(temp>0)
    {
        count++;
        temp = temp/10;
    }

    last_digit = num % 10;
    first_digit = (int)(num / pow(10,count-1));

    swap_num = (last_digit * (int)(pow(10, count-1)) + first_digit) + ((num - (first_digit * (int)(pow(10, count-1)))) - last_digit);

    printf("\nNumber after swapping first and last digit: %d", swap_num);
    getch();
}

Output

Enter the number        :3542

Number after swapping first and last digit: 2543