Question

How to get the rows and columns of a matrix (2D array) in C++

Answer 1

#include <iostream>

int main() {
    int arr[][4] = {     
                    {1, 2, 3, 5},  
                    {4, 5, 6, 5},  
                    {7, 8, 9, 5}  
                };  
 
    int rows = (sizeof(arr) / sizeof(arr[0]));  
    int cols = (sizeof(arr) / sizeof(arr[0][0])) / rows;  
           
    std::cout << "rows = " << rows << '\n';  
    std::cout << "cols = " << cols ;  
}  
 
 
 
 
/*
 
run:
 
rows = 3
cols = 4
 
*/

 

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Answer 2

#include <iostream>

int main() {
    int arr[][4] = {     
                    {1, 2, 3, 5},  
                    {4, 5, 6, 5},  
                    {7, 8, 9, 5}  
                };  
 
    int rows = sizeof(arr) / sizeof(arr[0]);
    int cols = sizeof(arr[0]) / sizeof(arr[0][0]);
    
    std::cout << "rows = " << rows << '\n';  
    std::cout << "cols = " << cols ;  
}  
 
 
 
 
/*
 
run:
 
rows = 3
cols = 4
 
*/

 

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