银行家四舍五入法

银行家四舍五入法规则:
四舍六入五考虑；五后非零可进一；五后皆零视奇偶，五前为偶（包括零）应舍去，奇进偶舍。

 

for (decimal  i = 0; i < 10; i++)
{
    decimal  x = i+0.405M;
    //double不适用

 

    //银行家四舍五入法 
    textBox1.Text+= (x + " Math.Round->" + Math.Round(x, 2).ToString())+"/r/n";
    //强制传统四舍五入法  
    textBox1.Text += (x + " Math.Round(x, 2, MidpointRounding.AwayFromZero)->" + Math.Round(x, 2, MidpointRounding.AwayFromZero).ToString()) + "/r/n";
    //强制银行家四舍五入法 
    textBox1.Text += (x + " Math.Round(x, 2, MidpointRounding.ToEven)->" + Math.Round(x, 2, MidpointRounding.ToEven).ToString()) + "/r/n";
    //传统的四舍五入法
    textBox1.Text += (x + " ToString(/"0.00/")->" + x.ToString("0.00")) + "/r/n"; 
}