C#實現大數字運算的實例代碼

2020-01-24 03:07:00

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C#實現大數字的運算
1、添加引用：System.Numerics.dll

2、添加命名空間：using System.Numerics;

3、實例：

3.1判斷一個數字是不是質數　

復制代碼代碼如下:

static void Main(string[] args)
        {
            Console.WriteLine("請輸入一個很大的數字：");
            string bigNumber = Console.ReadLine();
            BigInteger bigInteger = BigInteger.Parse(bigNumber);
            bool isNumber=false;
            for (BigInteger i = 2; i < BigInteger.Pow(bigInteger, 2);i++ )
            {
                if (bigInteger % i == 0)
                {
                    isNumber = true;
                    break;
                }
            }
            if (isNumber)
            {
                Console.WriteLine("不是質數");
            }
            else
            {
                Console.WriteLine("是質數");
            }
            Console.ReadLine();
        }

3.2實現兩個大數的加減乘除

復制代碼代碼如下:

static void Main(string[] args)
        {
            Console.Write("請輸入第一個大數字:");
            string bigNum1 = Console.ReadLine();
            BigInteger bigInt1 = BigInteger.Parse(bigNum1);

            Console.Write("請輸入第二個大數字:");
            string bigNum2 = Console.ReadLine();
            BigInteger bigInt2 = BigInteger.Parse(bigNum2);
            Console.Write(Environment.NewLine);

            BigInteger addNum = bigInt1 + bigInt2;
            BigInteger subNum = bigInt1 - bigInt2;
            BigInteger purNum = bigInt1 * bigInt2;
            BigInteger divNum = bigInt1 / bigInt2;

            Console.WriteLine("兩大數相加結果為：{0}",addNum);
            Console.WriteLine("兩大數相減結果為：{0}",subNum);
            Console.WriteLine("兩大數相乘結果為：{0}",purNum);
            Console.WriteLine("兩大數相除結果為：{0}",divNum);

Console.ReadLine();
}