Computer Applications

The population of a country in a particular year can be calculated by:
p*(1+r/100) at the end of year 2000, where p is the initial population and r is the
growth rate.
Write a program by using a class to find the population of the country at the end of each year from 2001 to 2007. The Class has the following specifications:
Class name — Population
Data Members — float p,r
Member Methods:
Population(int a,int b) — Constructor to initialize p and r with a and b respectively.
void print() — to calculate and print the population of each year from 2001 to 2007.

Java

Java Constructors

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Answer

import java.util.Scanner;

public class Population
{
    private float p;
    private float r;

    public Population(float a, float b)
    {
        p = a;
        r = b;
    }

    public void print() {
        float q = p;
        for (int y = 2001; y <= 2007; y++) {
            q = q * (1 + r / 100);
            System.out.println("Population in " + y + ": " + q);
        }
    }
    
    public static void main(String args[]) {
        
        Scanner in = new Scanner(System.in);
        System.out.print("Enter population in the year 2000: ");
        float x = in.nextFloat();
        System.out.print("Enter growth rate: ");
        float y = in.nextFloat();
        
        Population obj = new Population(x,y);
        obj.print();
    }
}

Variable Description Table

Program Explanation

Output

Answered By

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Define a class named FruitJuice with the following description:
Data Members Purpose
int product_code stores the product code number
String flavour stores the flavour of the juice (e.g., orange, apple, etc.)
String pack_type stores the type of packaging (e.g., tera-pack, PET bottle, etc.)
int pack_size stores package size (e.g., 200 mL, 400 mL, etc.)
int product_price stores the price of the product
Member Methods Purpose
FruitJuice() constructor to initialize integer data members to 0 and string data members to ""
void input() to input and store the product code, flavour, pack type, pack size and product price
void discount() to reduce the product price by 10
void display() to display the product code, flavour, pack type, pack size and product price

Data Members	Purpose
int product_code	stores the product code number
String flavour	stores the flavour of the juice (e.g., orange, apple, etc.)
String pack_type	stores the type of packaging (e.g., tera-pack, PET bottle, etc.)
int pack_size	stores package size (e.g., 200 mL, 400 mL, etc.)
int product_price	stores the price of the product

Member Methods	Purpose
FruitJuice()	constructor to initialize integer data members to 0 and string data members to ""
void input()	to input and store the product code, flavour, pack type, pack size and product price
void discount()	to reduce the product price by 10
void display()	to display the product code, flavour, pack type, pack size and product price

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Computer Applications

Java

Java Constructors

Answer

Variable Description Table

Program Explanation

Output

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