如何格式化双重结果并返回? [英] How to format double result and return?

问题描述

我想格式化结果并返回，我该怎么做?

I want to format result and return, how i can do that?

public virtual double GetArea()
{
    return Math.PI * this.radius * this.radius;
}

推荐答案

public virtual double GetArea()
{
    return Math.Round(Math.PI * this.radius * this.radius, 2);
}

Math.Round会将整数舍入到第二个参数中指定的小数位数-在这种情况下，它将舍入到小数点后两位.

Math.Round will round a integer to the number of decimal places specified in the second parameter - in this instance, it will round to two decimal places.

更新，以供参考；

Math.Floor向下舍入，Math.Ceiling向上舍入，Math.Truncate朝零舍入.因此，Math.Truncate对于正数类似于Math.Floor，对于负数类似于Math.Ceiling.

Math.Floor rounds down, Math.Ceiling rounds up, and Math.Truncate rounds towards zero. Thus, Math.Truncate is like Math.Floor for positive numbers, and like Math.Ceiling for negative numbers.

出于完整性考虑，Math.Round舍入到最接近的整数.如果数字恰好在两个整数之间，则将其舍入为偶数.

For completeness, Math.Round rounds to the nearest integer. If the number is exactly midway between two integers, then it rounds towards the even one.

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