2D数组，以奇怪的模式添加它的值

Question

i started learning C# and programming a few months ago and have some problems. The idea here is we create a 2 dimensional array (the number of rows / columns are added by the user), the numbers need to be between 1 and 10.

Then when the array is created the number sequence ( 3-5-7-9-11 etc) is started in the first and finishes in the last column. The rest of the numbers in the columns are added via keyboard by the user starting with the first row (ignoring column 1 and the last column cause we have that added).

The questions are :

• What will be the best way to check if the numbers of rows/columns are between 1 and 10? (I was thinking of IF-else but isn't there a better way ?)
• How will i make it so that the number sequence 3-5-7 etc is started in the first and finishes in the last column? Yeah i feel lost.

Where i am at the moment :

        Console.WriteLine("Add row value of 1-10");
        string s1
        s1 = Console.ReadLine();
        int k = int.Parse(s1);

        Console.WriteLine("Add column value of 1-10");

        string s2;
        s2 = Console.ReadLine();
        int p = int.Parse(s2);
        int[,] M = new int[k, p];

Example : we added k(row) & p(coulmn) value of 4.So the array should look like :

3 xx 11

5 xx 13

7 xx 15

9 xx 17

Then the X's should be added again manually without overwriting the existing numbers .The value of the numbers doesnt matter.

Answer 1

So... If I get it right you want to ask user the "length and width" of dynamical 2d array? To check if entered number is between 1 and 10 there's only 1 method:

int [,] M;

if (k >= 1 && k <= 10 && p >= 1 && p <= 10)
{
    M = new int[k,p];
}

And better is to do int.TryParse() for case if user enters characters there instead of numbers, or else you can easily get an Exception .

Filling with numbers:

int num = 3;
for (int i = 0; i < k; ++i)
{
    M[i,0] = num;
    num+=2;
}

for (int i = 0; i < k; ++i)
{
    M[i,p] = num;
    num+=2;
}

This adds numbers in 1st and last column in each row. After that to fill other cells manually you check every cell thet it is not in firs or last column. I hope I understood you correctly. Provided code may be simplified, but provided in such way for better understanding.

Answer 2

if(k>0 && k<11 && p>0 && p<11)
{
 int i;
 int M[,] = new int[k,p];
 for (i=0;i<k;i++)
 {
  M[i,0]=i*2+3;
  M[i,p-1]=(i+k)*2+3;
 }
}