C program to Find First and Last Digit of a Number

In this tutorial, i am going to show you how to find and print first and last digit of a number in c program using log() & pow() , while loop.

All C Program to Find First and Last Digit Of a Number

  • C Program to Print First and Last Digit Of a Number using Log10() and pow()
  • C Program to Print First and Last Digit Of a Number using While Loop

C Program to Find First and Last Digit Of a Number using Log10() and pow()

/**
 * 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);
    return 0;
}

The result of the above c program; as follows:

Enter any number: 1235
First digit = 1
Last digit = 5

C Program to Find First and Last Digit Of a Number using While Loop

#include <stdio.h>
int main()
{
    int n, sum=0, firstDigit, lastDigit;
    printf("Enter number = ");
    scanf("%d", &n);
    // Find last digit of a number
    lastDigit = n % 10;
    //Find the first digit by dividing n by 10 until n greater then 10
    while(n >= 10)
    {
        n = n / 10;
    }
    firstDigit = n;
    printf("first digit = %d and last digit = %d\n\n", firstDigit,lastDigit);
    return 0;
}

The result of the above c program; as follows:

Enter number = 2
first digit = 2 and last digit = 2

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