简单的输入输出、一维数组、二维数组、普通遍历、使用foreach语句遍历数组操作

简单的输入输出、一维数组、二维数组、普通遍历操作

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int ii = 10, jj = 11;
            Console.WriteLine("Hello World  " + ii + "  " + jj);
            Console.ReadLine();

            //一维数组
            int[] arr = new int[10] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
            for(int i = 0; i < arr.Length; i++){
                Console.Write(arr[i] + " ");
            }
            Console.WriteLine();
            Console.ReadLine();

            //二维数组
            int[,] MatrixEin = new int[3, 3] { { 2, 2, 1 }, { 1, 1, 1 }, { 1, 0, 1 } };
            
            Console.WriteLine("第一个矩阵");
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                    Console.Write(MatrixEin[i, j] + " ");
                Console.WriteLine();
            }
            
            Console.WriteLine("第二个矩阵");
            int[,] MatrixZwei = new int[3, 3] {{0, 1, 2}, {0, 1, 1}, {0, 1, 2}};
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                    Console.Write(MatrixZwei[i, j] + " ");
                Console.WriteLine();
            }
           
            int[,] MatrixResult = new int[3,3];
            for (int i = 0; i < 3; i++)
                for (int j = 0; j < 3; j++)
                    for (int k = 0; k < 3; k++)
                        MatrixResult[i, j] += MatrixEin[i, k] * MatrixZwei[k, j];
            Console.WriteLine("两个矩阵的乘积：");
            for(int i = 0; i < 3; i++){
                for (int j = 0; j < 3; j++)
                    Console.Write(MatrixResult[i, j] + " ");
                Console.WriteLine();
            }
            Console.ReadLine();
        }
    }
}

使用foreach语句遍历数组

foreach(【类型】 【迭代变量名】 in 【集合表达式】)

{

           语句

}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] strNames = { "第一句话", "第二句话", "第三句话", "第四句话", "第五句话" };
            foreach (string str in strNames)
            {
                Console.Write(str + " ");
            }
            Console.WriteLine();
            Console.ReadLine();
        }
    }
}