Switch Case Simplified: 5 Solved Practice Questions
This is the solution for the practice question set on the concepts of switch case and fall through. You can find the corresponding list of questions here. Try solving the questions yourself before you go through the solutions.
Grade Classification Based on Marks
Problem: Write a program to classify a student’s grade based on marks using a `switch` statement. The program should convert the student's marks to a grade letter:
- 90-100: "A"
- 80-89: "B"
- 70-79: "C"
- 60-69: "D"
- Below 60: "Fail"
Condition: To handle ranges in a `switch` statement, you can first convert marks to tens (e.g., 87 becomes 8) and use this in the `switch` case. Print the corresponding grade for each range.
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 marks,tens;
//taking the marks as input
System.out.print("Enter the student's marks : ");
marks=sc.nextInt();
tens=marks/10;
System.out.print("The grade is ");
//performing calculations
switch(tens)
{
case 9:
System.out.println("A.");
break;
case 8:
System.out.println("B.");
break;
case 7:
System.out.println("C.");
break;
case 6:
System.out.println("D.");
break;
default:
System.out.println("Fail.");
break;
}
}
}
Day of the Week Finder
Problem: Write a program that takes a number between 1 and 7 as input (e.g., 1 = Monday, 7 = Sunday) and displays whether it is a Weekday or a Weekend using the concept of `fall through` in switch.
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 day;
//taking the day number as input
System.out.println("For 1 = Monday and 7 = Sunday...");
System.out.print("Enter the day number : ");
day=sc.nextInt();
System.out.print("The day is a ");
//performing calculations
switch(day)
{
case 1:
case 2:
case 3:
case 4:
case 5:
System.out.println("weekday.");
break;
case 6:
case 7:
System.out.println("weekend.");
break;
default:
System.out.println("Invalid Input.");
break;
}
}
}
Vending Machine Simulator
Problem: Create a vending machine simulator that displays options for beverages:
- 1: Coffee - ₹20
- 2: Tea - ₹15
- 3: Juice - ₹30
- 4: Water - ₹5
Condition: Use a `switch` statement to take the user’s choice. Then take the number of beverages required as input and print the final bill. If the user selects an invalid option, print "Invalid selection."
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 choice, count;
//taking the choice as input
System.out.println("1: Coffee - Rs 20");
System.out.println("2: Tea - Rs 15");
System.out.println("3: Juice - Rs 30");
System.out.println("4: Water - Rs 5");
System.out.print("Enter the user's choice : ");
choice=sc.nextInt();
//taking the count of beverages required as input
System.out.print("Enter the no. of beverages required : ");
count=sc.nextInt();
System.out.print("The final bill is Rs ");
//performing calculations
switch(choice)
{
case 1:
System.out.println(20*count);
break;
case 2:
System.out.println(15*count);
break;
case 3:
System.out.println(30*count);
break;
case 4:
System.out.println(5*count);
break;
default:
System.out.println("Invalid selection.");
break;
}
}
}
Leap Year Checker Based on the Month and Year
Problem: Write a program that takes a month (1-12) and year as input and determines the number of days in that month, using the concept of fall through in `switch` statement.
Conditions:
- For February (month = 2), if it's a leap year, print "29 days"; otherwise, print "28 days."
- For months with fixed days (April, June, September, and November), print "30 days."
- For other months, print "31 days."
Use the `switch` statement to handle each month's case and apply an additional check for February.
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 month,year;
//taking the month and year as input
System.out.print("Enter the month number : ");
month=sc.nextInt();
System.out.print("Enter the year : ");
year=sc.nextInt();
System.out.print("The month has : ");
//performing calculations
switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
System.out.println("31 Days.");
break;
case 4:
case 6:
case 9:
case 11:
System.out.println("30 Days.");
break;
case 2:
if(year%4==0 && year%100!=0 || year%400==0)
{
System.out.println("29 Days.");
}
else
{
System.out.println("28 Days.");
}
break;
default:
System.out.println("Invalid Input.");
break;
}
}
}
Simple Calculator
Problem: Create a simple calculator using a `switch` case to handle different operations based on a menu. The menu should display:
- 1: Addition
- 2: Subtraction
- 3: Multiplication
- 4: Division
Conditions:
After the user chooses an option, prompt them to enter two numbers and perform the selected operation. Include a default case that says "Invalid operation, please try again."
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 choice, num1, num2;
//taking the choice as input
System.out.println("1: Addition");
System.out.println("2: Subtraction");
System.out.println("3: Multiplication");
System.out.println("4: Division");
System.out.println("5: Modulus");
System.out.print("Enter the user's choice : ");
choice=sc.nextInt();
//taking the numbers required as input
System.out.print("Enter the first number : ");
num1=sc.nextInt();
System.out.print("Enter the second number : ");
num2=sc.nextInt();
//performing calculations
switch(choice)
{
case 1:
System.out.println("Sum : "+(num1+num2));
break;
case 2:
System.out.println("Difference : "+(num1-num2));
break;
case 3:
System.out.println("Product : "+(num1*num2));
break;
case 4:
System.out.println("Quotient : "+(num1/num2));
break;
case 5:
System.out.println("Remainder : "+(num1%num2));
break;
default:
System.out.println("Invalid selection.");
break;
}
}
}
Numbers In Java : 10 Practice Problems a...
This is the solution for the practice question set on different numbers (like Harshad, Armstrong, Perfect, and so on).
Read More
For While Loops: 10 Practice Problems an...
This is the solution for the practice question set on the concept of iteration statements (for and while loops).
Read More
Mastering If-Else Statements: 8 Solved P...
This is the solution for the practice question set on conditional (if else) statements.
Read More