while (var != var)

Question

while (var != var) System.out.println(“循环.. ")；

执行它..如何使用declare..var

Answer 1

public static void main(String[] args) {
    double var = Double.NaN;
    System.out.println("var : " + var);
    while (var != var) {
        System.out.println(" I am inside loop now! ");
    }

}

Answer 2

假设这是家庭作业，我会给你一个提示，而不是答案。您需要这样定义var：

double var = // time for you to understand floating point

编辑:为了使这个答案更具一般性，这里是Wikipedia's entry on special floating-point values。

Answer 3

双精度变量= Double.NaN