Question

How to get random N rows from a 2D array in C++

Answer 1

#include <iostream>
#include <ctime>

#define ROWS 6
#define COLS 4

// Function to print a specific row from the array
void printRow(int arr[ROWS][COLS], int row) {
    std::cout << "row : " << row << std::endl;
    
    for (int j = 0; j < COLS; j++) {
        std::cout << arr[row][j] << " ";
    }
    
    std::cout << std::endl;
}

int main() {
    int arr[ROWS][COLS] = {
        {1, 3, 5, 0},
        {6, 8, 9, 1},
        {2, 3, 4, 5},
        {0, 6, 7, 9},
        {5, 7, 8, 3},
        {9, 8, 7, 4}
    };

    int N = 2;
    std::srand(std::time(0));

    for (int i = 0; i < N; i++) {
        int row = std::rand() % ROWS;
        printRow(arr, row);
    }
}


/*
run:

row : 3
0 6 7 9 
row : 1
6 8 9 1 

*/

 

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