# (JavaScript programming Example for Beginners)

# JavaScript Program to Convert Decimal to Binary

#### In this example, you will learn to write a JavaScript program that converts a decimal number to a binary number.

## Example 1: Convert Decimal to Binary

```
// program to convert decimal to binary
function convertToBinary(x) {
let bin = 0;
let rem, i = 1, step = 1;
while (x != 0) {
rem = x % 2;
console.log(
`Step ${step++}: ${x}/2, Remainder = ${rem}, Quotient = ${parseInt(x/2)}`
);
x = parseInt(x / 2);
bin = bin + rem * i;
i = i * 10;
}
console.log(`Binary: ${bin}`);
}
// take input
let number = prompt('Enter a decimal number: ');
convertToBinary(number);
```

**Output**

Step 1: 9/2, Remainder = 1, Quotient = 4 Step 2: 4/2, Remainder = 0, Quotient = 2 Step 3: 2/2, Remainder = 0, Quotient = 1 Step 4: 1/2, Remainder = 1, Quotient = 0 Binary: 1001

In the above program, the user is prompted to enter a decimal number. The number entered by the user is passed as an argument to the `convertToBinary()`

function.

The `while`

loop is used until the number entered by the user becomes **0**.

The binary value is calculated by:

`bin = bin + rem * i;`

Here, `rem`

is the modulus `%`

value of the number and `i` gives the place value of the binary number.

## Example 2: Convert Decimal to Binary Using toString()

```
// program to convert decimal to binary
// take input
let number = parseInt(prompt('Enter a decimal number: '));
// convert to binary
let result = number.toString(2);
console.log('Binary:' + ' ' + result);
```

**Output**

Enter a decimal number: 9 Binary: 1001

In the above program, the user is prompted to enter a number. The `parseInt()`

method is used to convert a string value to an integer.

The JavaScript built-in method `toString([radix])`

returns a string value in a specified radix(base). Here, `toString(2)`

converts the decimal number to binary number.

## JS Example for Beginners: JavaScript Program to Convert Decimal to Binary

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