Question

How to sum 2D array (matrix) in C

Answer 1

#include <stdio.h>
        
int sum_matrix(int matrix[][5])
{
    int sum = 0;
 
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 5; j++)
            sum += matrix[i][j];
    }
    return sum;
}
 
int main()
{
    int matrix[3][5] = { { 12, 43, 65, 10, 12 },
                         { 33, 42, 98, 80, 50 },
                         { 88, 77, 99, 100, 9843 } };
 
 
    printf("%d\n", sum_matrix(matrix));
 
    return 0;
}


/*
run:

10652

*/

 

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Answer 2

#include <stdio.h>
         
int sum_matrix(int matrix[][5], int rows, int cols)
{
    int sum = 0;

    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++)
            sum += matrix[i][j];
    }
    return sum;
}
  
int main()
{
    int matrix[3][5] = { { 12, 43, 65, 10, 12 },
                         { 33, 42, 98, 80, 50 },
                         { 88, 77, 99, 100, 9843 } };
  
    int rows = sizeof matrix / sizeof matrix[0];
    int cols = sizeof matrix[0] / sizeof(int);

    printf("%d\n", sum_matrix(matrix, rows, cols));
  
    return 0;
}
 
 
/*
run:
 
10652
 
*/

 

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