Question

Question 1
Write a program that reads from the user the height and radius of a cylinder, and then outputs the area of this cylinder. The area of the cylinder is calculated using the formula:
A=2*π*r*h+2*π*r2, where π = 3.14.
Sample run:
Enter the radius of the cylinder: 8.2
Enter the height of the cylinder: 9
The area of the cylinder is 885.75

Question 2
Write a program that reads the name, weight and height of a patient. Then the program outputs if the patient is under weight, average or over weight based on the following formula:
BMI = weight/height2
BMI < 20: Underweight
BMI between 20 and 25: Average
BMI > 25: Over weight

Sample run 1:
Enter your name: Samar
Enter your weight in kg: 70
Enter your height by meters: 1.67
Samar is overweight

Sample run 2:
Enter your name: Rola
Enter your weight in kg: 48
Enter your height by meters: 1.5
Rola is average

Sample run 3:
Enter your name: Rami
Enter your weight in kg: 85
Enter your height by meters: 1.88
Rami is underweight

Java language

Answer 1

Question 1:

1. create Scanner object
2. declare radius
3. declare height
4. declare and initialize pi
5. print message and read radius
6. print message and  read height
7. calculate area
8. print area

Program: Cylinder.java

import java.util.Scanner;
public class Cylinder{
        public static void main(String[] args){
                Scanner sc = new Scanner(System.in);                                            /* create Scanner object */
                double radius;                                                                                          /* declare radius */
                double height;                                                                                          /* declare height */
                double pi = 3.14;                                                                                       /* declare and initialize pi */
                System.out.print("Enter the radius of the cylinder: ");         /* print message */
                radius = sc.nextDouble();                                                                       /* read radius */
                System.out.print("Enter the height of the cylinder: ");         /* print message */
                height = sc.nextDouble();                                                                       /* read height */
                double area = 2*pi*radius*height + 2*pi*radius*radius;          /* calculate area */
                System.out.println("The area of the cylinder is " + area);      /* print area */
        }
}
                

Screenshot:

Output:

Question 2:

1. create Scanner object
2. declare weight and height
3. initialize BMI
4. print message and read name
5. print message and read weight
6. print message and  read height
7. calculate BMI
8. if BMI<20, print underweight
9. if BMI>25,  print overweight
10. otherwise, print average

Program: BMI.java

import java.util.Scanner;
public class BMI{
        public static void main(String[] args){
                Scanner sc = new Scanner(System.in);                                            /* create Scanner object */
                double weight;                                                                                          /* declare weight */
                double height;                                                                                          /* declare height */
                double BMI;                                                                                             /* initialize BMI */
                String name;
                System.out.print("Enter your name: ");                                          /* print message */
                name = sc.nextLine();                                                                           /* read name */
                System.out.print("Enter your weight in kg: ");                          /* print message */
                weight = sc.nextDouble();                                                                       /* read weight */
                System.out.print("Enter your height in meters: ");                      /* print message */
                height = sc.nextDouble();                                                                       /* read height */
                BMI = weight/(height*height);                                                           /* calculate BMI */
                if(BMI<20){
                        System.out.println(name + " is underweight");                   /* print underweight */
                }
                else if(BMI>25){
                        System.out.println(name +" is overweight");                     /* print overweight */
                }
                else{
                        System.out.println(name + " is average");                               /* print average */
                }
        }
}
                

Screenshot:

Output:

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