Q:

Java Program to find the sum of each row and each column of a matrix

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robaa
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2022-11-12
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In this program, we need to calculate the sum of elements in each row and each column of the given matrix

Above diagram shows the sum of elements of each row and each column of a matrix.

Algorithm

  • STEP 1: START
  • STEP 2: DEFINE rows, cols, sumRow, sumCol
  • STEP 3: INITIALIZE matrix a[][] ={{1, 2, 3},{4, 5, 6}, {7, 8, 9}}
  • STEP 4: rows = a.length
  • STEP 5: cols = a[0].length
  • STEP 6: REPEAT STEP 7 to STEP 10 UNTIL i<rows
            // for(i=0; i<rows; i++)
  • STEP 7: SET sumRow =0
  • STEP 8: REPEAT STEP 9 UNTIL j<cols
  • STEP 9: sumRow = sumRow + a[i][j]
  • STEP 10: PRINT i+1, sumRow
  • STEP 11: REPEAT STEP 12 to STEP 15 UNTIL i<cols
            //for(i=0; i<cols; i++)
  • STEP 12: SET sumCol =0
  • STEP 13: REPEAT STEP 14 UNTIL j<rows
            //for(j=0; j<rows; j++)
  • STEP 14: sumCol =sumCol + a[j][i]
  • STEP 15: PRINT i+1, sumCol
  • STEP 16: END
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All Answers

robaa
2022-11-12
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Program

public class SumofRowColumn    
{    
    public static void main(String[] args) {    
        int rows, cols, sumRow, sumCol;    
            
        //Initialize matrix a    
        int a[][] = {       
                        {1, 2, 3},    
                        {4, 5, 6},    
                        {7, 8, 9}    
                    };    
              
          //Calculates number of rows and columns present in given matrix    
          rows = a.length;    
        cols = a[0].length;    
            
        //Calculates sum of each row of given matrix    
        for(int i = 0; i < rows; i++){    
            sumRow = 0;    
            for(int j = 0; j < cols; j++){    
              sumRow = sumRow + a[i][j];    
            }    
            System.out.println("Sum of " + (i+1) +" row: " + sumRow);    
        }    
            
        //Calculates sum of each column of given matrix    
        for(int i = 0; i < cols; i++){    
            sumCol = 0;    
            for(int j = 0; j < rows; j++){    
              sumCol = sumCol + a[j][i];    
            }    
            System.out.println("Sum of " + (i+1) +" column: " + sumCol);    
        }    
    }    
}

Output:

Sum of 1 row: 6
Sum of 2 row: 15
Sum of 3 row: 24
Sum of 1 column: 12
Sum of 2 column: 15
Sum of 3 column: 18

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