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Program to find first and last digit



Program to find first and last digit

Logic to find first and last digit of a number

    Input a number from user. Store it in some variable say num.
    Find last digit using modulo division by 10 i.e. lastDigit = num % 10.
    To find first digit we have simple formula firstDigit = n / pow(10, digits - 1). Where digits is total number of digits in given number.

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

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

int main()
{
    int n, firstDigit, lastDigit, digits;

    /* Input a number from user */
    printf("Enter any number: ");
    scanf("%d", &n);

    /* Find last digit */
    lastDigit = n % 10;     

    /* Total number of digits - 1 */
    digits = (int)log10(n); 

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

    printf("First digit = %d\n", firstDigit);
    printf("Last digit = %d\n", lastDigit);

    printf("C Programming Language | Happy Codings :)");
    return 0;
}

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