我听说过 Java 中的一个转折点。如果有人知道正确的原因，您会被要求分享。 问题是:
double result1 = 1.0/0.0;
sop(result1); // output Infinity
double result2 = 0.0/0.0;
sop(result2); // output NaN
float 变量也是如此。但对于 int 类型，它会引发 ArithmeticException。为什么？
注意:我使用的是jdk 1.7
最佳答案
您不能使用 int 表示无穷大或 NAN。
来自 JLS
The result of a floating-point division is determined by the rules of IEEE 754 arithmetic:
Division of a nonzero finite value by a zero results in a signed infinity. The sign is determined by the rule stated above.
Why doesn't division by zero (or overflow, or underflow) stop the program or trigger an error? Why does a standard on numbers include "not-a-number" (NaN)? The 754 model encourages robust programs. It is intended not only for numerical analysts but also for spreadsheet users, database systems, or even coffee pots. The propagation rules for NaNs and infinities allow inconsequential exceptions to vanish. Similarly, gradual underflow maintains error properties over a precision's range.
When exceptional situations need attention, they can be examined immediately via traps or at a convenient time via status flags. Traps can be used to stop a program, but unrecoverable situations are extremely rare. Simply stopping a program is not an option for embedded systems or network agents. More often, traps log diagnostic information or substitute valid results.
Flags offer both predictable control flow and speed. Their use requires the programmer be aware of exceptional conditions, but flag stickiness allows programmers to delay handling exceptional conditions until necessary.
关于java - 除以 0.0 的核心 Java，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29370369/