Why in first if else statement the output is false where in the second if else statement the output is true???

Question

This is the code

https://code.sololearn.com/cpQgnA4utJZf/?ref=app

Answer 1

If you really want to geek out on understanding floating point numbers, there are a few really good videos on YouTube.

One video that came to mind when I saw this question is from a channel I subscribe to called Computerphiles:

https://youtu.be/PZRI1IfStY0

Answer 2

Because decimal floats are not exact. Since the numbers are converted from decimal to binary, the noninteger part usually has to be rounded. The rounding errors make it a hassle to compare floats for equality.
Search the internet for 'float comparison'.
The .5 is a specific case where the binary representation is exact. Well, it's just 1/2 in base 2. It would probably work with .25, .75, etc.

Answer 3

As an addition to what Emerson Prado is saying, if you change `float` to `double` it works.
That's because when you do `i==.7`, you are comparing doubles, not floats. When you put `0.7` into a float you lose precision which then makes `i` sliiiightly less or more than a double `0.7`.

Answer 4

Cpp en que se basa ,para que sirve?podrian decirme