Question

How to find 2D array (matrix) dimensions (rows, cols) in C

Answer 1

#include <stdio.h> 

int main(void)
{   
    int matrix[3][2] = {{1, 2},
                        {3, 4},
                        {5, 6}};
 
    size_t rows = sizeof matrix/sizeof matrix[0];
    size_t cols = (sizeof matrix/sizeof matrix[0][0])/rows;

    printf("rows = %lu\n", rows); // also try %zu for size_t
    printf("cols = %lu\n", cols); // also try %zu for size_t
            
    return 0;
}

  
/*
run:

rows = 3
cols = 2

*/

 

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