在 Java 中除以两个整数给我 0 还是 100？

Question

I'm trying to divide two integers and multiply by 100 but it keeps giving only 0 or 100. Can someone help me?

    int x= (a/b)*100;

if a was 500 and b was 1000 it would give me 0. The only time it will give me 100 is if a>=b. How can I fix this?

Thanks

Answer 1

您可以做的是强制它将a和b划分为双精度数，因此：

int x = (int) (((double) a / (double) b) * 100);

Answer 2

整数除法没有分数，所以 500 / 1000 = 0.5（这不是整数！）它被截断为整数 0。你可能想要

int x = a * 100 / b;

Answer 3

This sounds like you are not correctly typing your variables; two integer divisions result in an integer, not a float or double. For example:

(int)3 / (int)5 = 0
(float)3 / (float)5 = 0.6

Answer 4

Try this:

int x = a * 100 / b;

The idea is, you are first doing a / b , and because it's an integer operation, it'll round the result to 0 . Doing a * 100 first should fix it.

Answer 5

我发现的最简单、最有效的方法：

double x = (double) a / (double) b