Check If Numbers Have Same Last Digit

Last Digit Of Given Numbers Are Equal

This tutorial shows a snippet to find if the last digit of numbers are equal.

Logic:

• When we find the modulus of 10 of a given number we get the last digit of the number, e.g. 100 % 10 = 0 . Here, modulus is represented by %
• If we find the 10 modulus of given number and compare the values with each other we can find if the last digit of numbers are equal or not.

Pseudo-code

number1 = 10
number2 = 150

lastDigitNumber1 = number1 % 10
lastDigitNumber2 = number2 % 10

if( lastDigitNumber1 equals lastDigitNumber2 ) {
    print " The last digit of given numbers are equal." 
} else {
    print "The last digits are not equal"
}

JavaScript Syntax

const number1 = 10;
const number2 = 150;

const lastDigitNumber1 = number1 % 10;
const lastDigitNumber2 = number2 % 10;

if( lastDigitNumber1 === lastDigitNumber2 ) {
    console.log(`The last digit of given numbers: ${number1} and ${number2} are equal.`);
} else {
    console.log(`The last digit of given numbers: ${number1} and ${number2} are not equal.`);
}

/*
 * Output
 * prints: The last digit of given numbers: 10 and 150 are equal
*/

Now, the same code wrapped inside a function looks like

// function that checks if the last digit of given numbers are equal

function lastDigitalComparator(number1, number2) {
    const lastDigitNumber1 = number1 % 10;
    const lastDigitNumber2 = number2 % 10;

    if( lastDigitNumber1 === lastDigitNumber2 ) {
        console.log(`The last digit of given numbers: ${number1} and ${number2} are equal.`);
    } 
    else {
        console.log(`The last digit of given numbers: ${number1} and ${number2} are not equal.`);
    }
}

lastDigitalComparator(11, 41);
/*
 * Output
 * prints: The last digit of given numbers: 11 and 41 are equal
*/

 lastDigitalComparator(12, 56);
/*
 * Output
 * prints: The last digit of given numbers: 12 and 56 are not equal
*/