为什么模运算符不工作的双C#中? [英] Why is modulus operator not working for double in c#?
问题描述
考虑一下:
double x,y;
x =120.0;
y = 0.05;
double z= x % y;
我想这和预期的结果为0,但它出来0.04933333。
I tried this and expected the result to be 0, but it came out 0.04933333.
不过,
x =120.0;
y = 0.5;
double z= x % y;
确实给了0正确的结果。
did indeed gave the correct result of 0.
这是怎么回事?
我试过 Math.IEEERemainder(双,双)
,但它没有返回0无论是。这是怎么回事吗?
I tried Math.IEEERemainder(double, double)
but it's not returning 0 either. What is going on here?
另外,顺便说一句,什么是最合适的方式找到其余的在C#?
Also, as an aside, what is the most appropriate way to find remainder in C#?
推荐答案
双打从来没有准确值。 120可能是存储无损,但0.05不是。 0.5为1/2,所以它可以存储无损,你没有得到一个舍入误差。
doubles are never exact values. 120 is probably stored lossless, but 0.05 not. 0.5 is 1/2, so it could be stored lossless and you don't get a rounding error.
要具有准确的(十进制)号码,使用十进制
代替。
To have exact (decimal) numbers, use decimal
instead.
decimal x,y;
x =120.0M;
y = 0.05M;
decimal z = x % y; // z is 0
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