问题描述
double d=1/0.0;
System.out.println(d);
它打印 Infinity
,但如果我们写 double d = 1/0;
并打印,我们会得到这个例外:线程mainjava.lang中的异常
为什么Java知道在一种情况下潜水为零是无穷大,但是对于int 0,它没有被定义?
.ArithmeticException:/ by零
在D.main(D.java:3)
在这两种情况下,d是双重的,在这两种情况下,结果是无穷大。
It prints Infinity
, but if we will write double d=1/0;
and print it we'll get this exception: Exceptionin thread "main" java.lang.ArithmeticException: / by zero at D.main(D.java:3)
Why does Java know in one case that diving by zero is infinity but for the int 0 it is not defined?In both cases d is double and in both cases the result is infinity.
推荐答案
浮点数据类型具有保留的特殊值以表示无穷大,整数值不。
Floating point data types have a special value reserved to represent infinity, integer values do not.
在你的代码中 1/0
是一个整数除法,当然会失败。但是, 1 / 0.0
是一个浮点分区,因此导致 Infinity
。
In your code 1/0
is an integer division that, of course, fails. However, 1/0.0
is a floating point division and so results in Infinity
.
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