#include #include #include using namespace std; // Function prototypes void fillVector2D(vector> &vect2D); void displayVector2D(vector> &vect2D); int getMaxVector2D(vector> &vect2D); int getMinVector2D(vector> &vect2D); /* main() * * Program to demonstrate the use of a 2D Vector object. * * This progra demonstrates the creation of a 2D Vector object, * how to declare functions that accept a 2D vector as a * parameter, how to handle a 2D vector passed as an argument to a * function, and how to pass a 2D vector to a function. * */ int main() { // Variable declarations int rows, cols; vector> my2DVector; // This is the 2D Vector // Seed the random number generator srand(time(0)); // Set the 2D Vector dimensions at run time. // This could also be done with user input values rows = 8; cols = 20; // Resize the 2D Vector at runtime my2DVector.resize(rows, vector(cols)); cout << "The 2D Vector contains " << rows << " rows and " << cols << " columns." << endl; // Randomise the 2D Vector's contents fillVector2D(my2DVector); // Display the 2D Vector displayVector2D(my2DVector); // Display the maximum value cout << "MAX: " << getMaxVector2D(my2DVector) << endl; // Display the minimum value cout << "MIN: " << getMinVector2D(my2DVector) << endl; return 0; } /* fillVector2D() * * This function fills a 2D Vector object with random integer values. * * Parameters: * * vect2D: A 2D Vector of integers passed by reference. * * Returns: * * Upon completion the 2D vector is filled with random integer * values. Does not return any other value. * */ void fillVector2D(vector> &vect2D) { for(int i = 0; i < (int) vect2D.size(); i++){ for(int j = 0; j < (int) vect2D[i].size(); j++){ vect2D[i][j] = 1 + rand() % 25; } } } /* displayVector2D() * * This function writes a 2D Vector object to the standard output. * * Parameters: * * vect2D: A 2D Vector of integers passed by reference. * * Returns: * * Writes the contents of the 2D Vector object to standard output. * Each row is displayed on a separate line with the numbers * padded with a leading zero if required and separated by * a single space. Does not return any other value. * */ void displayVector2D(vector> &vect2D) { for(vector vect : vect2D){ for(int x : vect){ cout << setw(2) << setfill('0') << x << " "; } cout << endl; } } /* getMaxVector2D() * * This function processes a 2D Vector object to determine the * maximum value. * * Parameters: * * vect2D: A 2D Vector of integers passed by reference. * * Returns: * * Integer representing the maximum value in the 2D Vector object. * */ int getMaxVector2D(vector> &vect2D) { int max = vect2D[0][0]; for(vector vect : vect2D){ for(int x : vect){ if(x > max){ max = x; } } } return max; } /* getMinVector2D() * * This function processes a 2D Vector object to determine the * minimum value. * * Parameters: * * vect2D: A 2D Vector of integers passed by reference. * * Returns: * * Integer representing the minimum value in the 2D Vector object. * */ int getMinVector2D(vector> &vect2D) { int min = vect2D[0][0]; // iterate through the 2D Vector for(vector vect : vect2D){ for(int x : vect){ if(x < min){ min = x; } } } return min; }

2D Vector Demo