C PROGRAMMING PROGRAM • OPERATORS & CONVERSIONS

Find the Last Digit of an Integer

Learn how to find the last digit of an integer using a clear C program.

BeginnerModulusabs()Integer digits

PROBLEM UNDERSTANDING

Input and expected output

Sample input

-483

Sample output

Last digit = 3

COMPLETE C PROGRAM

Complete C implementation

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    int number;

    printf("Enter an integer: ");
    scanf("%d", &number);
    printf("Last digit = %d\n", abs(number % 10));
    return 0;
}

CURRENT STEP

Select Start to walk through the important lines.

SELECTED LINE

No line selected

EXPECTED OUTPUT FOR THE SAMPLE

Last digit = 3

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Read the required input values.
Take the remainder after division by 10 and use abs() for negative inputs.
Display the computed result.

Take the remainder after division by 10 and use abs() for negative inputs.

EFFICIENCY

Time and space complexity

Time complexity

O(1)

Auxiliary space

O(1)

DEBUGGING CHECKLIST

Common mistakes

Check this

Use the correct format specifier for every variable.

Check this

Initialize variables before using their values.

Check this

Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.