Explicit conversion confusion in C#

Asked Nov 28 '22 at 21:33

Active Nov 28 '22 at 21:49

Viewed 33 times

When I am doing:

(a)

int fah1 = 0:

float fah_to_cel1 = (fah1 - 32) / 9 * 5;

The value of fah1 still remains -15 which is similar when I declare fah_to_cel1 as int.

But when I do:

(b)

int fah1 = 0;

float fah_to_cel1 = ((float)fah1 - 32) / 9 * 5;

Then I get fah_to_cel1 as -17.777777778 which is right.

Why there is a need to explicitly convert the fah_to_cel1 to float to get the right answer?

edited Nov 28 '22 at 21:49

asked Nov 28 '22 at 21:33

Rohan

use float literals not integer literals eg. `32f` – Rand Random Nov 28 '22 at 21:35
FYI your question is unrelated to unity3d and game development – Rand Random Nov 28 '22 at 21:37
Besides first comment by @RandRandom, you could also try `float fah1 = 0f;` – Rick Davin Nov 28 '22 at 21:45
`-32 / 9 = -3`, `-3 * 5 = -15`. This is due to integer math. – hijinxbassist Nov 28 '22 at 21:49
1

Perhaps you are accustomed to Python where "/" always produces a float result. In C/C++/C#, using the `/` operator on integers returns an integer. – Tim Roberts Nov 28 '22 at 21:50
Thanks @TimRoberts for making me understand it. – Rohan Nov 28 '22 at 21:58

0 Answers0