Creating a 3x3 matrix with user input numbers C#

Question

im trying to create a 3x3 matrix in c# language, i know how to create the matrix but i need help for user input numbers. I hope someone can help me thank you for that.

Answer 1

I will add a while loop and use double.TryParse to validate user's input. Usin BWHazel's code:

const int MATRIX_ROWS = 3;
const int MATRIX_COLUMNS = 3;

double[,] matrix = new double[MATRIX_ROWS, MATRIX_COLUMNS];

for (int i = 0; i < MATRIX_ROWS; i++)
{
    for (int j = 0; j < MATRIX_COLUMNS; j++)
    {
        double input;
        Console.Write("Enter value for ({0},{1}): ", i, j);
        while (!double.TryParse(Console.ReadLine(), out input)
        {
            Console.Write("Enter correct value for ({0},{1}): ", i, j);
        }
        matrix[i,j] = input
    }
}

To get the totals for all rows you can use following snippet:

for (int i = 0; i < MATRIX_ROWS; i++) 
{
    // The some for each row
    double sum = 0.0;
    for (int j = 0; j < MATRIX_COLUMNS; j++)
    {
        sum += matrix[i,j];
    }
    Console.WriteLine(string.format("The sum for row {0} is: {1}", i, sum));
}

Answer 2

If you are using the command-line, something like this should work:

const int MATRIX_ROWS = 3;
const int MATRIX_COLUMNS = 3;

double[,] matrix = new double[MATRIX_ROWS, MATRIX_COLUMNS];

for (int i = 0; i < MATRIX_ROWS; i++)
{
    for (int j = 0; j < MATRIX_COLUMNS; j++)
    {
        Console.Write("Enter value for ({0},{1}): ", i, j);
        matrix[i,j] = double.Parse(Console.ReadLine());
    }
}

This assumes you are using double for the values. The .Parse() method is available for all .NET numeric types including int.