Question

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

Answer 1

#include <iostream>

using std::cout;
using std::endl;


int main()
{
	int matrix[][5] = { { 12, 43, 65, 10, 19 },
	                    { 33, 42, 98, 80, 50 },
	                    { 88, 77, 99, 100, 9843 } };

	int rows = sizeof matrix / sizeof matrix[0];
	int cols = sizeof matrix[0] / sizeof(int);

	cout << "rows: " << rows << endl;
	cout << "cols: " << cols << endl;

	return 0;
}


/*
run:

rows: 3
cols: 5

*/

 

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