C# Bug --强制类型转换

    技术2022-05-12  2

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    下面是一段非常简单的C#源码,程序中首先定义单精度浮点数f,并对其进行赋值,运算后取整转换,最后输出计算结果,1.3*100取整后应为130,但程序给出的结果为129

     

    using System;

    namespace testPro

    {

        class Program

        {

            static void Main()

            {

                float f = 1.3F; //step 1

                int ret = (int)(f * 100); //step 2

                Console.WriteLine(ret);//step 3

    //result is 129 !!!!!!!!!!! why??

            }

        }

    }

    如果将step  2分解为以下两条语句,则结果为130

                  float temp = f * 100;

            int ret = (int)temp;

     

    测试环境:

    Windows Server 2003

    Visual Studio 2005(8.050727)

    Microsoft .NET Framework 2.0.50727


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