How do I send a 2D array into a function in C ?

Question

I need to send a 2D array into a function. I've seen it done with the command std::vector or something like that, but i have not learned that yet. Is there a way to do it using just a regular call by reference? Everytime I try to do that I get an error. Could someone please write a small sample code of how to send a 2D array into a function (without using std::vector -- if possible)

Answer 1

Array is passed by pointer, not by value. You must pass length of first dimension as an additional parameter and type array size of all other dimensions starting from second:

base_type[][depth]...

For example:

#include <cstdlib>

#include <iostream>

void passArray(int a[][2], int length) {

  for (int i=0; i<length; i++) {

    std::cout << "{";

    for (int j=0; j<2; j++) {

      std::cout << a[i][j];

      if (j<1) std::cout << ",";

      

    }

    std::cout << "}";    

  }    

}

int main(int argc, char *argv[])

{

    int b=2;

    

    int a[3][2]={{0,0},{1,2},{1,4}};

    passArray(a,3);

    

    system("PAUSE");

    return EXIT_SUCCESS;

}