Mastering If-Else Statements: 8 Solved Practice Questions
This is the solution for the practice question set on conditional (if else) statements. You can find the list of questions here. Try solving the questions yourself before you go through the solutions.
Electricity Billing System
Problem: Write a program to calculate the electricity bill based on the following rates:
- Tier 1: First 100 units – ₹5 per unit
- Tier 2: Next 100 units (101-200) – ₹7 per unit
- Tier 3: Above 200 units – ₹10 per unit
CODE :
import java.io.*;
import java.util.*;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//declaring all variables
double units, ebill=0.0;
//taking the number of units as input
System.out.print("Enter no. of units : ");
units=sc.nextDouble();
//performing calculations
if(units<=100)
{
ebill=units*5;
}
else if(units>100 && units<=200)
{
ebill=500+(units-100)*7;
}
else
{
ebill=500+700+(units-200)*10;
}
//printing ebill as output
System.out.println("Electricity Bill : "+ebill);
}
}
Library Late Fee Calculation
Problem: A library charges a late fee based on the number of days a book is overdue:
- 1-5 days: ₹5 per day
- 6-10 days: ₹10 per day
- More than 10 days: ₹20 per day
CODE :
import java.io.*;
import java.util.*;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//declaring all variables
int days, lfee=0;
//taking the number of overdue days as input
System.out.print("Enter no. of days : ");
days=sc.nextInt();
//performing calculations
if(days<=5)
{
lfee=days*5;
}
else if(days>5 && days<=10)
{
lfee=25+(days-5)*10;
}
else
{
lfee=25+50+(days-10)*20;
}
//printing lfee as output
System.out.println("Library Late Fee : "+lfee);
}
}
Income Tax Calculation
Problem: Write a program that calculates income tax based on the following slabs:
- Below ₹2.5 lakh: No tax
- ₹2.5 lakh to ₹5 lakh: 5% tax
- ₹5 lakh to ₹10 lakh: 20% tax
- Above ₹10 lakh: 30% tax
CODE :
import java.io.*;
import java.util.*;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//declaring all variables
double salary, tax=0.0;
//taking the salary amount as input
System.out.print("Enter the salary : ");
salary=sc.nextDouble();
//performing calculations
if(salary<=250000)
{
tax=0.0;
}
else if(salary>250000 && salary<=500000)
{
tax=0.05*salary;
}
else if(salary>500000 && salary<=1000000)
{
tax=0.2*salary;
}
else
{
tax=0.3*salary;
}
//printing tax as output
System.out.println("Tax amount on salary : "+tax);
}
}
Telecom Bill Calculation
Problem: A telecom company charges for internet usage as follows:
- Up to 10 GB: ₹100 per GB
- 11-20 GB: ₹80 per GB
- Above 20 GB: ₹50 per GB
- Condition: If the customer has a “premium” membership, apply a 15% discount to the total bill. Calculate the final bill considering the membership status.
CODE :
import java.io.*;
import java.util.*;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//declaring all variables
double usage, tbill=0.0;
char ch;
//taking the internet usage as input
System.out.print("Enter the internet usage in GB : ");
usage=sc.nextDouble();
//performing calculations
if(usage<=10)
{
tbill=usage*100;
}
else if(usage>10 && usage<=20)
{
tbill=1000+(usage-10)*80;
}
else
{
tbill=1000+800+(usage-20)*50;
}
//confirming the premium membership
System.out.println("Does the customer have a premium membership? ");
System.out.print("Y/N ? ");
ch=sc.next().charAt(0);
if(ch=='Y')
{
tbill=tbill-(0.15*tbill);
}
//printing tax as output
System.out.println("Final bill considering membership status : "+tbill);
}
}
Grade Classification with Bonus Points
Problem: In a university, grades are calculated based on a score out of 100:
- 90-100: A
- 80-89: B
- 70-79: C
- Below 70: Fail
- Condition: If the student has participated in extracurricular activities, add 5 bonus points to their score before grading. Write a program that determines the final grade with these conditions.
CODE :
import java.io.*;
import java.util.*;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//declaring all variables
double score;
char ch;
String grade="";
//taking the score as input
System.out.print("Enter the score : ");
score=sc.nextDouble();
//confirming extracurricular participation
System.out.println("Did the student participate in extracurriculars? ");
System.out.print("Y/N ? ");
ch=sc.next().charAt(0);
if(ch=='Y')
{
score=score+5;
}
//performing calculations
if(score>=90 && score<=100)
{
grade="A";
}
else if(score>=80 && score<=89)
{
grade="B";
}
else if(score>=70 && score<=79)
{
grade="C";
}
else if(score<70)
{
grade="Fail";
}
//printing final grade
System.out.println("Final grade : "+grade);
}
}
Hospital Bill Calculation Based on Room Type
Problem: A hospital charges for rooms as follows:
- General Ward: ₹1,000 per day
- Semi-Private: ₹2,000 per day
- Private Room: ₹3,500 per day
- Condition: If a patient is a senior citizen, apply a 10% discount on the total bill. Calculate the final bill amount for the patient based on the number of days and room type.
CODE :
import java.io.*;
import java.util.*;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//declaring all variables
int room,days;
double tbill=0.0;
char ch;
//taking the room type as input
System.out.println("1 for General-Ward");
System.out.println("2 for Semi-Private");
System.out.println("3 for Private Room");
System.out.print("Enter the room type number : ");
room=sc.nextInt();
//taking the number of days as input
System.out.print("Enter the no. of days : ");
days=sc.nextInt();
//performing calculations
if(room==1)
{
tbill=days*1000;
}
else if(room==2)
{
tbill=days*2000;
}
else if(room==3)
{
tbill=days*3500;
}
else
{
System.out.println("Invalid Room Type!");
}
//confirming senior citizenship
System.out.println("Is the patient more than 60 years old? ");
System.out.print("Y/N ? ");
ch=sc.next().charAt(0);
if(ch=='Y')
{
tbill=tbill-(0.10*tbill);
}
//printing tax as output
System.out.println("Final bill considering age : "+tbill);
}
}
Online Store Discount Calculation
Problem: An online store offers discounts based on the purchase amount:
- Below ₹1,000: No discount
- ₹1,000-₹5,000: 10% discount
- ₹5,000-₹10,000: 15% discount
- Above ₹10,000: 20% discount
- Condition: For “VIP” customers, apply an additional 5% discount on the final amount after the initial discount. Write a program to calculate the final amount for both regular and VIP customers.
CODE :
import java.io.*;
import java.util.*;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//declaring all variables
double purchase,fbill=0.0;
char ch;
//taking the purchase amount as input
System.out.print("Enter the purchase amount : ");
purchase=sc.nextDouble();
//performing calculations
if(purchase<=1000)
{
fbill=purchase;
}
else if(purchase>1000 && purchase<=5000)
{
fbill=purchase-(0.10*purchase);
}
else if(purchase>5000 && purchase<=10000)
{
fbill=purchase-(0.15*purchase);
}
else
{
fbill=purchase-(0.2*purchase);
}
//confirming VIP membership
System.out.println("Is the customer a VIP member? ");
System.out.print("Y/N ? ");
ch=sc.next().charAt(0);
if(ch=='Y')
{
fbill=fbill-(0.05*fbill);
}
//printing final bill as output
System.out.println("Final bill considering membership : "+fbill);
}
}
Leap Year
Problem: Write a program that takes a year as input and prints whether it is a leap year or not (i.e., divisible by 4, but not 100, unless divisible by 400).
CODE :
import java.io.*;
import java.util.*;
class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//declaring all variables
int year;
//taking the year as input
System.out.print("Enter the year : ");
year=sc.nextInt();
//performing calculations
if(year%4==0 && year%100!=0 || year%400==0)
{
System.out.println("A Leap Year!");
}
else
{
System.out.println("Not a Leap Year!");
}
}
}
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