Java Calculator - Task 1
This project is a simple command-line calculator written in Java.
It allows users to perform Addition, Subtraction, Multiplication, and Division on two integers repeatedly until they choose to exit.
This task demonstrates basic Java programming concepts like loops, methods, and switch-case statements.
Features
- ✅ Addition of two integers
- ✅ Subtraction of two integers
- ✅ Multiplication of two integers
- ✅ Division of two integers
- ✅ Menu-driven program with looping
- ✅ Exit option to safely terminate
- ✅ Handles invalid inputs with error message
Technologies Used
- Language: Java
- JDK Version: 8 or above
- IDE: Eclipse
Code Overview
- Uses
Scanner to take user input.
- Runs in a continuous
while(true) loop until “Exit” is chosen.
- Implements a switch-case for different operations.
- Separate static methods:
- addition(int a, int b)
- subtraction(int a, int b)
- multiplication(int a, int b)
- division(int a, int b)
- Prints “Invalid input” if an unsupported option is entered.
- Uses “System.exit(0)” to terminate.
Program Flow
- The program asks for two integer inputs.
- Displays a menu of operations.
- Performs the selected operation using the respective method.
- Loops back to the menu until Exit (5) is chosen.
- Prints results in the console.
🧑💻 Sample Output
Enter first number: 10
Enter second number: 5
1 addition
2 subtraction
3 multiplication
4 division
5 exit
Enter your choice: 1
Result: 15
Enter your choice: 3
Result: 50
Enter your choice: 4
Result: 2
Enter your choice: 5
Exiting...
Notes
- Division is integer division, meaning results will not have decimals.
- Make sure the second number is not zero when performing division to avoid errors.
- For floating-point calculations, modify the program to use
double instead of int.
Author
- Naveen Kumar Amudala
- GitHub
-
LinkedIn
- Support floating-point arithmetic
- Implement GUI version of the calculator