42 lines
1.3 KiB
C#
42 lines
1.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace ConsoleApplication2
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{
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class Program
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{
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static void Main(string[] args)
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{
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while (true)
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{
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//π/4 = 1 -1/3 +1/5 -1/7 +1/9 -1/11 +……，精确至少4位小数.
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Console.WriteLine("请输入运算次数进行下一次计算...");
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decimal a = decimal.Parse(Console.ReadLine());
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Console.WriteLine("输入的次数: {0}", a);
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decimal result = 0;
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bool add = true;
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for (decimal i = 1; i < a; i += 2)
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{
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//result += 1d / (2d * i - 1d) * Math.Pow(-1d, i - 1d);
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if (add)
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{
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result += 1m / i;
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add = false;
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}
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else
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{
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result -= 1m / i;
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add = true;
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}
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//Console.WriteLine(result * 4d);
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}
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Console.WriteLine("PI的结果为: {0}", (result * 4m));
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Console.WriteLine("PI的结果为: {0}", (result * 4m).ToString("#0.0000"));
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}
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}
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}
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}
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