C

strcpy strcat

arduino <syntaxhighlight> char* str = "Hello"; char dest[12];

strcpy( dest, str ); strcat( dest, ".txt" ); </syntaxhighlight>

multidim char arrays

<syntaxhighlight>

1. include <iostream>
2. include <cstring>

using namespace std;

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

   unsigned i;

   // Declaration of the two-dimensional array
   // as a pointer to pointer
   //
   char** array_2D;
   unsigned ROWS = 10;
   unsigned COLUMNS = 10;

   // Allocate "main" array
   //
   array_2D = new char*[ROWS];

   // Allocate each member of the "main" array
   //
   for (i = 0; i < ROWS; ++i)
       array_2D[i] = new char[COLUMNS];

   // Fill the 6th element with a string and
   // print it out
   //
   strcpy(array_2D[5], "Hey there");
   cout << array_2D[5] << endl;

   // Deletion is performed in reversed order.
   // Pay special attention to the delete[]
   // operator which must be used to delete
   // arrays (instead of the "simple" delete)
   //
   for (i = 0; i < ROWS; ++i)
       delete[] array_2D[i];

   delete[] array_2D;

   return 0;

} </syntaxhighlight>

Two-dimensional arrays != double pointers

You almost certainly need dynamic memory allocation for this. You also want to deep copy the contents of the array - it's a non-static local variable, so it's invalid out of its scope. You can't do TYPE arr[sz]; return arr; as a consequence. <syntaxhighlight> const size_t width = 3; const size_t height = 5; TimeSlot tmpTimeSlot[width][height];

systemMatrix = malloc(width * sizeof systemMatrix[0]); for (int i = 0; i < width; i++) {

   systemMatrix[i] = malloc(height * sizeof systemMatrix[i][0]);
   for (int j = 0; j < height; j++) {
       systemMatrix[i][j] = tmpTimeSlot[i][j];
   }

}

--- or ---

char (*place)[columns] = malloc(rows * sizeof *place);
place[2][3];

</syntaxhighlight>