using System; namespace ConsoleApp1 { class Program { static void Main(string[] args) { double a, b, c, d; a = 0.123456789; b = Math.Round(a,5);//四舍五入 b = 0.12346 c = Math.Truncate(a * 100000) / 100000;//舍弃后面一切数值 c = 0.12345 d = (double)((int)(a * 100000)) /100000;//舍弃后面一切数值 d = 0.12345 Console.Write($"a={a} b={b} c={c} d={d} "); a = 0.1234512345; b = Math.Round(a, 5);//四舍五入 b = 0.12345 c = Math.Truncate(a * 100000) / 100000;//舍弃后面一切数值 c = 0.12345 d = (double)((int)(a * 100000)) / 100000;//舍弃后面一切数值 d = 0.12345 Console.Write($"a={a} b={b} c={c} d={d} "); Console.ReadKey(); } } }
结果