how to modify 2d array in function c++

void Insert_into_2D_Array(int** foo, int x_pos, int y_pos, int x_size, int y_size) { int insert_value = 10; if (x_pos < x_size && y_pos < y_size) { foo[x_pos][y_pos] = insert_value; // insert_value lost post func exit? } } void Init_2D_Array(int** foo, int x_size, int y_size) { foo = new int*[x_size]; // new alloc mem lost post func exit ? for (int i=0;i<x_size;i++) { foo[i] = new int[y_size]; // new alloc mem lost post func exit } } int main(int agc, char** argv) { int** foo; int x_size=10, y_size=10; Init_2D_Array(foo, x_size, y_size); Insert_into_2D_Array(foo, 3,3, x_size, y_size); }

void Insert_into_2D_Array(int** foo, int x_pos, int y_pos, int x_size, int y_size) { int insert_value = 10; if (x_pos < x_size && y_pos < y_size) { foo[x_pos][y_pos] = insert_value; // insert_value lost post func exit } } int** Init_2D_Array(int x_size, int y_size) { int** foo = new int*[x_size]; // new alloc mem lost post func exit for (int i = 0; i<x_size; i++) { foo[i] = new int[y_size]; // new alloc mem lost post func exit } return foo; } int main() { int** foo; int x_size = 10, y_size = 10; foo = Init_2D_Array(x_size, y_size); Insert_into_2D_Array(foo, 3, 3, x_size, y_size); return 0; }

void Insert_into_2D_Array(int** foo, int x_pos, int y_pos, int x_size, int y_size)
{
  int insert_value = 10000;

  if (x_pos < x_size && y_pos < y_size) {
    (foo)[x_pos][y_pos] = insert_value;    // insert_value lost post func exit
  }
}

void Init_2D_Array(int*** foo, int x_size, int y_size)
{

  *foo = new int*[x_size];    // new alloc mem lost post func exit
  for (int i=0;i<x_size;i++)
  {
      (*foo)[i] = new int[y_size];     // new alloc mem lost post func exit
  }
}

void main(){

      int** foo = NULL;
      int x_size=10, y_size=10;
      Init_2D_Array(&foo, x_size, y_size);
      Insert_into_2D_Array(foo, 3,3, x_size, y_size);

      cout<<"#############  "<<foo[3][3]<<endl;
}

Posted by: Guest on March-25-2021

Source

class Array2D { private: int* m_array; int m_sizeX; int m_sizeY; public: Array2D(int sizeX, int sizeY) : m_sizeX(sizeX), m_sizeY(sizeY) { m_array = new int[sizeX*sizeY]; } ~Array2D() { delete[] m_array; } int & at(int x, int y) { return m_array[y*sizeX + x]; } };

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