Question

Write a C# console program that fills the right to left diagonal of a square matrix with zeros, the lower-right triangle with -1s, and the upper left triangle with +1s. Let the user enter the size of the matrix up to size 21. Use a constant and error check. Output the formatted square matrix with appropriate values. Refer to the sample output below.

Sample Run:

*** Start of Matrix ***

Enter the size of square (<= 21): 5
1 1 1 1 0

1 1 1 0 -1

1 1 0 -1 -1

1 0 -1 -1 -1

0 -1 -1 -1 -1

*** End of Matrix **

Answer 1

`Hey,

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using System;

class MainClass {

public static void Main (string[] args) {

int size;

Console.Write("*** Start of Matrix ***\n\nEnter the size of square (<= 21): ");

size = Convert.ToInt32(Console.ReadLine());

if (size < 0 || size > 21) {

Console.WriteLine("Invalid size!!");

return;

}

int[,] arr = new int[size,size];

for (int i=0; i<size; i++) {

for (int j=0; j<size; j++) {

if (i + j == size-1) {

arr[i,j] = 0;

} else if (i + j < size-1) {

arr[i,j] = 1;

} else {

arr[i,j] = -1;

}

}

}

for (int i=0; i<size; i++) {

for (int j=0; j<size; j++) {

Console.Write(arr[i,j] + " ");

}
Console.WriteLine("");
}

}

}

​​​​​​​

Kindly revert for any queries

Thanks.