C # Part---Two-dimensional array, split split;

Two-dimensional arrays
How to define:

int[,] array = new int[3, 4]{
{1,2,3,4},
{3,4,5,6},
{5,6,7,8}
}; 3 indicates that there are three one-dimensional arrays
4 means that there are 4 elements in each of the one-dimensional arrays.

Split () split with * * *
The split content needs to be placed in an array of type string, without having to define the length of the array

string s = Console.ReadLine ();
string[] Array = s.split ('-');
foreach (string AA in Array)
{
Console.WriteLine (AA);
}

Enter the number of classes,
Enter the number of words in each person's English score
The Chinese two highest score, mathematics two lowest score, English average score

 //Console.WriteLine ("Please enter class Number:"); //int n = Int.                Parse (Console.ReadLine ()); //double[,] Chengji = new double[n, 3]; //for (int i = 0; i < n; i++)//{                //Console.Write ("Please enter the results of the language of the student in {0}:", (i + 1)); //chengji[i, 0] = double.                Parse (Console.ReadLine ()); //Console.Write ("Please enter the score for the math of the {0} students:", (i + 1)); //chengji[i, 1] = double.                Parse (Console.ReadLine ()); //Console.Write ("Please enter the result of the student in English of {0}:", (i + 1)); //chengji[i, 2] = double.                Parse (Console.ReadLine ()); //}                //For (int j = 0; J < N-1; J + +)//{                //for (int k = j + 1; k < n; k++)//    {                //if (chengji[j, 0] < Chengji[k, 0])//        {                //Double zhong = chengji[j, 0]; //chengji[j, 0] = chengji[k, 0]; //chengji[k, 0] = Zhong; //double zhong1 = chengji[j, 1]; //chengji[j, 1] = chengji[k, 1]; //chengji[k, 1] = zhong1; //double zhong2 = chengji[j, 2]; //chengji[j, 2] = chengji[k, 2]; //chengji[k, 2] = zhong2; //        }                //    }                //}                //Console.WriteLine ("Two of the highest language scores were {0},{1}", Chengji[0, 0], chengji[1, 0]); //For (int w = 0; w < n-1; w++)//{                //for (int y = w + 1; y < n; y++)//    {                //if (chengji[w, 1] < Chengji[y, 1])//        {                //Double zhong = chengji[w, 0]; //chengji[w, 0] = chengji[y, 0]; //chengji[y, 0] = Zhong; //double zhong1 = chengji[w, 1]; //chengji[w, 1] = chengji[y, 1]; //chengji[y, 1] = zhong1; //double zhong2 = chengji[w, 2]; //chengji[w, 2] = chengji[y, 2]; //chengji[y, 2] = zhong2; //        }                //    }                //}                //Console.WriteLine ("The lowest two digits of the math score are {0},{1}", Chengji[n-1, 1], chengji[n-2, 1]); //double sum = 0; //for (int k = 0; k < n; k++)//{                //sum = sum + chengji[k, 2]; //}                //Console.WriteLine ("Average English score is: {0}", (sum/n));

Randomly enter 20 numbers into the array,
Removes the value on an even index in the array, puts it in another array, and prints it out

//random ran=new random (); //Int[]aa=new int[20]; //Int[]bb=new int[10]; //for (int i = 0; i < 20;i++)//{                //Aa[i] = ran.                Next (); //}                //foreach (int cc in AA)//{                //Console.WriteLine (CC); //}                //Console.Write ("Please press ENTER to continue.)                "); //Console.ReadLine (); //For (int j = 0; J < 10;j++)//{                //bb[j]=aa[j*2+1]; //}                //foreach (int dd in BB)//{                //Console.WriteLine (DD); //}

C # Part---Two-dimensional array, split split;