Java汇总了任何数字 [英] Java Round up Any Number

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问题描述

我似乎无法找到我正在寻找的关于一个简单问题的答案:如何将任何数字舍入到最近的 int



例如,每当数字为0.2,0.7,0.2222,0.4324,0.9999时,我希望结果为1.



<到目前为止,我已经

  int b =(int)Math.ceil(a / 100); 

但它似乎没有完成这项工作。

解决方案

Math.ceil() 是要调用的正确函数。我猜 a int ,这会使 a / 100 执行整数运算。请尝试 Math.ceil(a / 100.0)

  int a = 142; 
System.out.println(a / 100);
System.out.println(Math.ceil(a / 100));
System.out.println(a / 100.0);
System.out.println(Math.ceil(a / 100.0));
System.out.println((int)Math.ceil(a / 100.0));

输出:

  1 
1.0
1.42
2.0
2

请参阅 http://ideone.com/yhT0l


I can't seem to find the answer I'm looking for regarding a simple question: how do I round up any number to the nearest int?

For example, whenever the number is 0.2, 0.7, 0.2222, 0.4324, 0.99999 I would want the outcome to be 1.

So far I have

int b = (int) Math.ceil(a / 100);

It doesn't seem to be doing the job, though.

解决方案

Math.ceil() is the correct function to call. I'm guessing a is an int, which would make a / 100 perform integer arithmetic. Try Math.ceil(a / 100.0) instead.

int a = 142;
System.out.println(a / 100);
System.out.println(Math.ceil(a / 100));
System.out.println(a / 100.0);
System.out.println(Math.ceil(a / 100.0));
System.out.println((int) Math.ceil(a / 100.0));

Outputs:

1
1.0
1.42
2.0
2

See http://ideone.com/yhT0l

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