Question

How to define, initialize and print 2D array (matrix) in C++

Answer 1

#include <iostream>
#include <iomanip>

#define ROWS 3
#define COLS 5

using std::cout;
using std::endl;
using std::setw;
 
int main()
{
    int matrix[ROWS][COLS] = {  { 12, 43, 65, 10, 12 },
                                { 33, 42, 98, 80, 50 },
                                { 88, 77, 99, 100, 9843 }  };
 
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++)
            cout << setw(5) << matrix[i][j];
        cout << endl;
    }
}
 
 
 
 
/*
run:
 
   12   43   65   10   12
   33   42   98   80   50
   88   77   99  100 9843
 
*/

 

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Answer 2

#include <iostream>
#include <iomanip>

#define ROWS 3
#define COLS 5

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

void print(int matrix[][5]) {
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++)
            cout << setw(5) << matrix[i][j];
        cout << endl;
    }
}
 
int main()
{
    int matrix[ROWS][COLS] = {  { 12, 43, 65, 10, 12 },
                                { 33, 42, 98, 80, 50 },
                                { 88, 77, 99, 100, 9843 }  };
 
 
    print(matrix);
}
 
 
 
 
/*
run:
 
   12   43   65   10   12
   33   42   98   80   50
   88   77   99  100 9843
 
*/

 

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Answer 3

#include <iostream>

#define ROWS 2
#define COLS 3
   
void print_matrix(int matrix[][COLS], int rows, int cols) {
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            std::cout << matrix[i][j] << " ";
        }
        std::cout << "\n";
    }
}
    
int main() {
    int matrix[ROWS][COLS] = {{4, 7, 1}, {3, 6, 2}};
  
    print_matrix(matrix, ROWS, COLS);
}
    
   
   
    
/*
run:
     
4 7 1 
3 6 2 
   
*/

 

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