Question

How to sum 2D array (matrix) rows in Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        int[][] matrix = {{31, 22, 33}, 
                          {42, 85, 987}};
        int[] rows_sum = {0, 0};
        
        sum_matrix_rows(matrix, rows_sum);
        
        for (int i = 0; i < 2; i++) 
            System.out.println(rows_sum[i]);
    }
    public static void sum_matrix_rows(int[][] matrix, int[] rows_sum) {
        int rows = matrix.length;
        int cols = matrix[0].length;
          
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++)
                 rows_sum[i] += matrix[i][j];
        }
    }
}
   
/*
                  
run:
     
86
1114
         
*/

 

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