Question

3. What is the output of the following program?

#include <iostream>

using namespace std;

void showDouble(int); //Function prototype

int main()

{

int num;

for (num = 0; num < 10; num++)

showDouble(num);

return 0;

}

// Definition of function showDouble

void showDouble(int value)

{

cout << value << ‘\t’ << (value * 2) << endl;

}

Please do the following Program and hand in the code and sample runs.

1. Write a program using the following function prototypes:
   • double getLength();
   • double getWidth();
   • double getArea(double len, double wid);
   • void displayData(double len, double wid, double area);

Write function main which calls these four functions. In your function definitions make sure that the length and width are positive numbers.

Hand in 2 runs showing valid and invalid data.

Answer 1

/*If you any query do comment in the comment section else like the solution*/

import java.util.Scanner;

public class Main {     
        public static Scanner keyboard = new Scanner(System.in);
        public static void main(String[]args) {
                double length;
                double width;           
                double area;    
                length = getLength();           
                width = getWidth();
                area = calculateArea(length, width);
                printResults(length, width, area);
                System.out.println();   
        }
        private static void printResults(double length, double width, double area) {
                System.out.printf("Dimensions: %.1f X %.1f\n", length, width);          
                System.out.printf("Area: %.2f\n", area);
                
        }
        private static double calculatePerimeter(double length, double width) {
                return (2*(length + width));            
        }
        private static double calculateArea(double length, double width) {
                return (length*width);
        }
        private static double getWidth() {
                double width;
                do {
                        System.out.print("Enter the width: ");
                        width = keyboard.nextDouble();
                        if(width <= -1) {
                                System.out.println("Width must be positive! Try Again");
                        }
                }while(width <= -1);
                return width;   
        }
        private static double getLength() {
                double length;
                do {
                        System.out.print("Enter the width: ");
                        length = keyboard.nextDouble();
                        if(length <= -1) {
                                System.out.println("Width must be positive! Try Again");
                        }
                }while(length <= -1);
                return length;          
        }       
}