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问题描述
我有点困惑，也许有人能够解释它；在以下3个命令中...
Hi, I am a bit confused with something, perhaps somebody is able to explain it; in the following 3 commands ...
double z1 = (double) ( 12 / 5 );
System.out.println( z1 ); // = 2.0
double z2 = 12 / 5;
System.out.println( z2 ); // = 2.0
double z3 = (double) 12 / 5 ;
System.out.println( z3 ); // = 2.4
...似乎只有第三个可以正确计算.
如果将变量定义为Double，是否不告诉系统它是带有小数位的数字变量?如果是这样，为什么前2条语句给出的结果不正确?！?
... only the third one seems to do the correct calculation.
If a variable is defined as a Double, are you not telling the system that it is a numeric variable with decimal places ? If so, why do the first 2 statements give an incorrect result ?!?
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