Question

How to find the sum of each row and each column of a matrix (2D array) in C#

Answer 1

using System;

class Program
{
    static void Main() {
        int[,] arr = {     
                        {1, 2, 3, 5},  
                        {4, 5, 6, 5},  
                        {7, 8, 9, 5}  
                    };  
            
        int rows = arr.GetLength(0);  
        int cols = arr.GetLength(1);  
          
        int sumRow, sumCol; 
        for (int i = 0; i < rows; i++){  
            sumRow = 0;  
            for (int j = 0; j < cols; j++){  
              sumRow = sumRow + arr[i, j];  
            }  
            Console.WriteLine("Sum of row: " + i + " = " + sumRow);  
        }  
          
        for (int i = 0; i < cols; i++){  
            sumCol = 0;  
            for(int j = 0; j < rows; j++){  
              sumCol = sumCol + arr[j, i];  
            }  
            Console.WriteLine("Sum of col: " + i + " = " + sumCol);  
        }
    }
}




/*
run:

Sum of row: 0 = 11
Sum of row: 1 = 20
Sum of row: 2 = 29
Sum of col: 0 = 12
Sum of col: 1 = 15
Sum of col: 2 = 18
Sum of col: 3 = 15

*/

 

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