Find Sum of Each Row and Column of a Matrix in C++

In this tutorial, we will be discussing a program to find the sum of each row and each column for a given matrix.

For this, we will be given with a say A*B matrix. Our task is to traverse through all the elements of the matrix and find the sum of each row and each column of the matrix.

Example

#include <iostream>
using namespace std;
#define m 7
#define n 6
//calculating sum of each row
void calc_rsum(int arr[m][n]){
   int i,j,sum = 0;
   for (i = 0; i < 4; ++i) {
      for (j = 0; j < 4; ++j) {
         sum = sum + arr[i][j];
      }
      cout << "Sum of the row "<< i << ": " << sum << endl;
      sum = 0;
   }
}
//calculating sum of each column
void calc_csum(int arr[m][n]) {
   int i,j,sum = 0;
   for (i = 0; i < 4; ++i) {
      for (j = 0; j < 4; ++j) {
         sum = sum + arr[j][i];
      }
      cout << "Sum of the column "<< i << ": " << sum <<endl;
      sum = 0;
   }
}
int main() {
   int i,j;
   int arr[m][n];
   int x = 1;
   for (i = 0; i < m; i++)
   for (j = 0; j < n; j++)
   arr[i][j] = x++;
   calc_rsum(arr);
   calc_csum(arr);
   return 0;
}

Output

Sum of the row 0: 10
Sum of the row 1: 34
Sum of the row 2: 58
Sum of the row 3: 82
Sum of the column 0: 40
Sum of the column 1: 44
Sum of the column 2: 48
Sum of the column 3: 52