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JavaScript | Numbers

  • Last Updated : 21 Dec, 2020

JavaScript numbers are always stored as double-precision 64-bit binary format IEEE 754. 
This format stores numbers in 64 bits, 

  • 0-51 bit stores value(fraction)
  • 52-62 bit stores exponent
  • 63-bit stores sign

The types of number literals You can use decimal, binary, octal, and hexadecimal.

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  • Decimal Numbers: 
    JavaScript Numbers does not have different types of numbers(ex: int, float, long, short) which other programming languages do. It has only one type of number and it can hold both with or without decimal values.
Var a=33;
var b=3.3;
var x = 0562   //x will be 370(parsed as an octal number).
  • If the number starts with 0 and the following number is smaller than 8. It will be parsed as an Octal Number.
    Integers are accurate up to 15 digits: 
var a = 999999999999999;   // a will be 999999999999999
var b = 9999999999999999;     // b will be 10000000000000000
  • The floating point is not 100% accurate. The maximum number of decimals is up to 17.
var x = 0.22 + 0.12;   //x will be 0.33999999999999997
  • Example-1: 

html




<!DOCTYPE html>
<html>
 
<body>
 
    <h2>
      JavaScript Numbers
  </h2>
 
    <p id="num"></p>
 
 
    <script>
        var x = 0.22 + 0.12;
        document.getElementById(
          "num").innerHTML =
          "0.22 + 0.12 = " + x;
    </script>
 
</body>
 
</html>
  • Output: 
     

  • Binary Numbers 
    They start with 0b or 0B followed by 0’s and 1’s. 
     
var x = 0b11;        // x will be 3
var x = 0B0111;       // x will be 7
  • Example-2: 

html




<!DOCTYPE html>
<html>
 
<body>
 
    <h2>
      JavaScript Numbers
  </h2>
 
    <p id="num"></p>
 
 
    <script>
        var x = 0 B0111;
        document.getElementById(
          "num").innerHTML =
          "0B0111 will be " + x;
    </script>
 
</body>
 
</html>
  • Output: 
     

  • Octal Numbers 
    They start with 0 followed by a number of ranges from 0-7. If any number is used it will be taken as a decimal number. 
var x = 0111;      //x will be 73
var x = 07123;     //x will be 3667
  • Example-3: 

html




<!DOCTYPE html>
<html>
 
<body>
 
    <h2>
      JavaScript Numbers
  </h2>
 
    <p id="num"></p>
 
 
    <script>
        var x = 07123;
        document.getElementById(
          "num").innerHTML =
          "07123 will be " + x;
    </script>
 
</body>
 
</html>
  • Output: 
     

  • Hexadecimal Numbers 
    They start with 0x or 0X followed by any digit belonging (0123456789ABCDEF) 
var x = 0xfff;         //x will be 4095
  • Example-2: 

html




<!DOCTYPE html>
<html>
 
<body>
 
    <h2>JavaScript Numbers</h2>
 
    <p id="num"></p>
 
 
    <script>
        var x = 0xfff;
        document.getElementById(
          "num").innerHTML =
          "0xfff will be " + x;
    </script>
 
</body>
 
</html>
  • Output: 

  • Exponentiation: 
var x = 2E5   // x will be 200000
var x = 34e3   // x will be 34000
var x = 23e-5 //x will be 0.00023
  • JavaScript uses the + operator for both addition and concatenation. 
    • Addition: 
var a = 20;
var b = 20;
var c = a + b;           // c will be 40 (a number)
  • Concatenation: 
var a = "10";
var b = "20";
var c = a + b;           // c will be 1020 (a string)
  • Numeric Strings 
    NaN is a reserved word indicating not a number.
 var x= "12345" ;        // x will be a string(NaN)   
 var x = 67 ;            // x will be number



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