#include #include using namespace std; // Function prototypes void fillArray2D(int nrows, int ncols, int* ptr); void displayArray2D(int nrows, int ncols, int* ptr); int getMaxArray2D(int nrows, int ncols, int* ptr); int getMinArray2D(int nrows, int ncols, int* ptr); /* main() * * Program to demonstrate the use of dynamic arrays using the * C++ new and delete operators. * * This program demonstrates the creation of a dynamic array, * how to declare functions that accept a pointer to this * array as a parameter, how to handle a pointer to an array * passed as an argument to a function, and how to pass a * pointer to an array to a function. * */ int main(void) { // Variable declarations int* pIntArray; int cols, rows; // Seed the random number generator srand(time(NULL)); // Set the 2D Array dimensions at run time. // This could also be done with user input values rows = 8; cols = 20; cout << "The 2D Array contains " << rows << " rows and " << cols << " columns." << endl; // Dynamically allocate memory for the array // using the new operator. pIntArray = new int [rows * cols]; // Always test for a valid pointer if(pIntArray == NULL) { // Terminate the program if the memory allocation failed cout << endl << "Memory allocation error." << endl; exit(1); } // Fill array with random data fillArray2D(rows, cols, pIntArray); // Display Array displayArray2D(rows, cols, pIntArray); // Display the maximum value cout << "MAX: " << getMaxArray2D(rows, cols, pIntArray) << endl; // Display the minimum value cout << "MIN: " << getMinArray2D(rows, cols, pIntArray) << endl; // Clean up and exit delete [] pIntArray; // Free up memory return 0; } /* fillArray2D() * * This function fills a 2D dynamic Array with random integer * values. * * Parameters: * * nrows: Integer representing the number of rows * ncols: Integer representing the number of columns * ptr: A pointer to a block of memory containing the * array of integers. * * Returns: * * Upon completion the array is filled with random integer * values. Does not return any other value. * */ void fillArray2D(int nrows, int ncols, int* ptr) { for(int i=0; i max) { max = *(ptr + (i * ncols) + j); } } } return max; } /* getMinArray2D() * * This function processes a 2D dynamic array to determine * the minimum value. * * Parameters: * * nrows: Integer representing the number of rows * ncols: Integer representing the number of columns * ptr: A pointer to a block of memory containing the * array of integers. * * Returns: * * Integer representing the minimum value in the 2D array. * */ int getMinArray2D(int nrows, int ncols, int* ptr) { int min = *ptr; for(int i=0; i

Dynamic Arrays C++