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Program to find sum of first and last digit without using loop

Program to find sum of first and last digit without using loop

Write a C program to input a number and find sum of first and last digit of the number using for loop. How to find sum of first and last digit of a number in C programming using loop. Logic to find sum of first and last digit of a number without using loop in C program.

/* C program to find sum of first and last digit of a number */

#include <stdio.h>
#include <math.h>

int main()
{
    int j, sum, digits, firstDigit, lastDigit;

    sum = 0;

    /* Input a number from user */
    printf("Enter any number to find sum of first and last digit: ");
    scanf("%d", &j);
    
    /* Find last digit */
    lastDigit  = j % 10;

    /* Find total number of digits - 1 */
    digits    = (int) log10(j); 

    /* Find first digit */
    firstDigit = (int) (j / pow(10, digits)); 

    /* Calculate the sum */
    sum = firstDigit + lastDigit; 

    printf("Sum of first and last digit = %d", sum);

    return 0;
}

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