Shubham TiwariHello Everyone today i will be discussing this famous question
Why 0.1 + 0.2 === 0.3 is false?
Let's get started...
I am using Javascript to show this but this comparison of floating point can be seen in other programming languages as well where they also return false for this comparison.
Code Example -
console.log(0.1 + 0.2 === 0.3)
//output - false
- It returned false but 0.1 + 0.2 = 0.3 then it why it didn't returned true?
- Well These floating point numbers cannot be precisely represented in Base 2 floating point number.This Explaination of base 2 concept is quite complicated to show but i will show you the simple reason why it happened.
console.log(0.1 + 0.2)
// output - 0.30000000000000004
- The actual output of those 2 numbers is 0.30000000000000004 that's why it returned false because we are comparing this
console.log(0.3 === 30000000000000004)
// false
- Now you understand why it returned false.
console.log(0.1 + 0.2 === 0.30000000000000004)
//output - true
- This time it will return true
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