Question

我想要求更多澄清。这是我的示例程序

double diff = 7.500 - 7.500;
System.out.println(diff); // result 0.0
if (diff > 0) {
    System.out.println("+" + diff ); //result +0.0
} else {
    System.out.println("-" + diff ); //result -0.0
}

我的结果是 -0.0 。我的期望是0 == 0.0然后跳过if else条件。但是它进入了else条件。双倍0.0大于或小于0？

Answer 1

请注意，您正在检查diff＆gt; 0 - 所以如果它为零，则表示正在打印-0.0

Answer 2

在您的情况下，您使用（更大）>将0.0与0进行比较，因此0.0不是严格大于0，（它是相等的）。然后您的程序转到else部分。

if(diff == 0 ) {
    System.out.println("+" + diff ); //result 0.0
} else if (diff > 0) {
    System.out.println("+" + diff ); //result +diff
} else { // diff is less than 0 
    System.out.println("-" + diff ); //result -diff
}

Answer 3

这是我的答案：

double diff = 7.500 - 7.500;
    System.out.println(diff);

    if(diff>0){
        System.out.println("+"+diff);
    }else if(diff<0){
        System.out.println("-"+diff);
    }else if(diff==0){
        System.out.println("="+diff);
    }
}

我的结果是：
0.0
= 0.0

你必须忘记0.0等于0是'否则0.0＆gt; 0'其他'0.0＆gt; = 0'

在java

3 个答案: