#include #include #include // 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 malloc() and free() functions. * * 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; printf("The 2D Array contains %d rows and %d columns.\n", rows, cols); // Dynamically allocate memory for the array // using the malloc() function. pIntArray = (int*) malloc(rows * cols * sizeof(int)); // Always test for a valid pointer if(pIntArray == NULL) { // Terminate the program if the memory allocation failed printf("Memory allocation error!\n"); exit(1); } // Fill array with random data fillArray2D(rows, cols, pIntArray); // Display Array displayArray2D(rows, cols, pIntArray); // Display the maximum value printf("MAX: %d\n", getMaxArray2D(rows, cols, pIntArray)); // Display the minimum value printf("MIN: %d\n", getMinArray2D(rows, cols, pIntArray)); // Clean up and exit free(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