question3.cpp

/*
 * Using functions, write a program to compute the area and perimeter of a square.
 * The program should ask the user to enter a number corresponding to the side length
 * of the square and display the area and perimeter of the square
 */

#include <iostream>

// Function to calculate the perimeter of the square based on the length provided
double calculatePerimeter(double sideLength) {
    return sideLength * 4;
}

// Function to calculate the area of the square based on the length provided
double calculateArea(double sideLength) {
    return sideLength * sideLength;
}

int main() {
    // Declaration of variables
    double sideLength;

    // Prompt the user to enter the side length of the square
    std::cout << "Enter the length of the square: ";
    std::cin >> sideLength;

    if (std::cin.fail()) {
        // Gracefully handle a case where the user enters a string.
        std::cout << "Invalid input! Please enter a number.";
        return 1;
    } else if (sideLength < 0) {
        // Gracefully handles a case where the side length entered is less than 0.
        std::cout << "Side length cannot be negative!";
        return 1;
    } else {
        // Display the perimeter and the area of the square
        std::cout << "The perimeter of the square with length " << sideLength << " is " << calculatePerimeter(sideLength) << " units\n";
        std::cout << "The area of the square with length " << sideLength << " is " << calculateArea(sideLength) << " square units" << std::endl;
        return 0;
    }

}