Hướng dẫn javascript divide get integer

1. Get the Quotient and Remainder of an Integer Division Using the Math Library in JavaScript
2. Get the Quotient and Remainder of an Integer Division Using the Bitwise Operators in JavaScript

This tutorial will discuss how to get the quotient and remainder of a division using the Math library and bitwise operators in JavaScript.

Get the Quotient and Remainder of an Integer Division Using the Math Library in JavaScript

In JavaScript, we can divide two variables easily, and the result is in floating-point numbers, but if we want to get the quotient and remainder of the division, we can use the Math library, providing us with a lot of functions. For example, we can get the quotient of a division using the Math.floor() or Math.trunc() function which converts the floating-point number to an integer, and to get the remainder, we can use the % character. For example, let’s find the quotient and remainder of 13 divided by 5. See the code below.

var a = 13;
var b = 5;
var quo = Math.floor(a/b);
var rem = a%b;
console.log('Quotient = ',quo,'Remainder = ',rem);

Output:

Quotient =  2 Remainder =  3

Note that the Math library will fail if the numbers are too large. You can also use the Math.trunc() function which can handle large numbers as compared to the Math.floor() function. The Math.floor() function will fail in the case of negative numbers, but Math.trunc() won’t fail in case of negative numbers.

Get the Quotient and Remainder of an Integer Division Using the Bitwise Operators in JavaScript

In JavaScript, we can get the quotient and remainder of a division using the bitwise operators. For example, we can get the quotient of a division using the bitwise NOT ~~ or bitwise OR |0, which converts the floating-point number to an integer. And to get the remainder, we can use the % character. For example, let’s find the quotient and remainder of 13 divided by 5. See the code below.

var a = 13;
var b = 5;
var quo = ~~(a/b);
var rem = a%b;
console.log('Quotient = ',quo,'Remainder = ',rem);

Output:

Quotient =  2 Remainder =  3

As you can see, the output is the same as of the above method. The performance of bitwise operators is greater as compared to the Math library, but the capacity to handle large numbers is less. So, if you have small numbers, you can use the bitwise operators; otherwise, use the Math library. The bitwise operators can also handle negative numbers. You can also use the parseInt() function to convert a floating-point number to an integer. If you don’t want to use any functions, you can use a simple formula with the remainder operator % as shown below.

var a = 13;
var b = 5;
var rem = a%b;
var quo = (a-rem)/b;
console.log('Quotient = ',quo,'Remainder = ',rem);

Output:

Quotient =  2 Remainder =  3

As you can see, the output is the same as of the above methods.

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