using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace helloworld2 { class Program { static void Main(string[] args) { int[,] a = new int[3, 3]; int[,] b = new int[3, 3]; int[,] c = new int[3, 3]; Console.WriteLine("enter array a 3x3:"); for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) a[i, j] = int.Parse(Console.ReadLine()); } Console.WriteLine("enter array b 3x3:"); for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) b[i, j] = int.Parse(Console.ReadLine()); } int input; Console.WriteLine("enter 1 if want it addition...enter 2 if want it subtraction....enter 3 if want it multiplication.....enter 4 if want divition"); input = int.Parse(Console.ReadLine()); switch (input) { case 1: for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) c[i, j] = a[i, j] + b[i, j]; } Console.Write("\n"); Console.WriteLine("the the addition of array:"); for (int i = 0; i < 3; i++) { Console.Write("\n"); for (int j = 0; j < 3; j++) Console.Write(" " + c[i, j]); }break; case 2: for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) c[i, j] = a[i, j] - b[i, j]; } Console.Write("\n"); Console.WriteLine("the the subtraction of array:"); for (int i = 0; i < 3; i++) { Console.Write("\n"); for (int j = 0; j < 3; j++) Console.Write(" " + c[i, j]); }break; case 3: for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) c[i, j] = a[i, j] * b[i, j]; } Console.Write("\n"); Console.WriteLine("the the multiplication of array:"); for (int i = 0; i < 3; i++) { Console.Write("\n"); for (int j = 0; j < 3; j++) Console.Write(" " + c[i, j]); }break; case 4: for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) c[i, j] = a[i, j] / b[i, j]; } Console.Write("\n"); Console.WriteLine("the divition of an array:"); for (int i = 0; i < 3; i++) { Console.Write("\n"); for (int j = 0; j < 3; j++) Console.Write(" " + c[i, j]); }break; default:Console.WriteLine("error input");break; } Console.ReadKey(); } } }

(addition,subtract,multiply,division) of array