How to add values in a two dimensional array

Question

I have to add the values of cell with even row and odd column indexes, for example twoDArray[2,5], two twoDarray[4,3]

public int twoDim( int [,] twoDArray)

//My if condition has syntax and logic errors.

{
int sum = 0;
for( int i = 0; i< twoDArray.Length i++)
{
for (int j = 0; j < twoDArray.Length; j++)
{
if ( twoDArray[(i/2==0 && j / 2 != 2]) //My if condition has syntax and logic errors.
{
sum += twoDArray[i, j];
}
}
}
return sum;
}

Answer 1

also dont use Length
use GetLength(d) where d is the dimension

i < twoDArray.GetLength(0);

and

j < twoDArray.GetLength(1);

Answer 2

https://code.sololearn.com/cIsqYH1EO3Rv/?ref=app

Answer 3

Taste
I don't understand, how can the code run, while the array was defined without using `new`. My understanding of multidimensional array definition was something like this.

int [,]i = new int[4, 2] {{2,3},{2,5},{4,5},{3,5}};

Has things changed now that such multidimensional array definition is valid? (as seen in the code)
(Edited)

Answer 4

tbh, i'm not really sure when it was change. i wasnt use c# for very long.
but it seems its valid now. as long as the declaration tell the array dimension.

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/arrays/multidimensional-arrays

Answer 5

Thank you Taste 🙏

Answer 6

Microne mafika Here is an alternative with GetLength without the if's

https://code.sololearn.com/c9I8mAWNTBUS/?ref=app

Answer 7

declare twoDim as static.
public static int twoDim

Answer 8

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{

public static int twoDim( int [,] twoDArray)

//My if condition has syntax and logic errors.

{
int sum = 0;
for( int i = 0; i< twoDArray.Length; i++)
{
for (int j = 0; j < twoDArray.Length; j++)
{
if (i%2==0&&j%2!=0)
{
sum += twoDArray[i, j];
}
}
}
return sum;
}

static void Main(string[] args)
{
int [,]i ={{2,3},{2,5},{4,5},{3,5}};
Console.Write(twoDim(i));
}
}
}

Answer 9

Length return the total of the elements, thats where the error come from. first dimension only has length of 4, but Length return 8.

https://code.sololearn.com/c12B6O6k6uLS/?ref=app

Answer 10

i have implement this idea but my program is still not work

Answer 11

no. this a the output

./Playground/file0.cs(34,18): error CS0120: An object reference is required for the non-static field, method, or property 'Program.twoDim(int[*,*])'

Answer 12

i did make it static

Answer 13

Hello

Answer 14

import java.util.Scanner;
public class numbereveorodd
{
public static void main(String args[])
{
int x;
Scanner sc=new Scanner(System.in);
System.out.println("enter any number:");
x=sc.nextInt();
if (x%2==0)
{
System.out.println("number is even");
}
else
{
System.out.println("number is odd");
}
}
}
Whats wrong with my code please help me guys?

Answer 15

What is billing?