Question

How to calculate the cell number of a matrix (2D array) in C++

Answer 1

#include <iostream>
 
#define ROWS 5
#define COLS 4
   
int main(void) {
    int matrix[ROWS][COLS] = {
                { 0,  1,  2,  3},
                { 4,  5,  6,  7},
                { 8,  9, 10, 11},
                {12, 13, 14, 15},                
                {16, 17, 18, 10}
    };
       
    int x = 2, y = 2;
    std::cout << x * COLS + y << "\n";
  
    x = 3, y = 2;
    std::cout << x * COLS + y << "\n";
     
    return 0;
}
   
   
   
   
/*
run:
   
10
14
   
*/

 

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