Unlock the Power of Java: Building a Simple Calculator
When it comes to programming in Java, understanding how to utilize the switch statement and Scanner class can open up a world of possibilities. In this example, we’ll explore how to create a simple calculator that takes user input and performs basic arithmetic operations.
Gathering User Input with the Scanner Class
The Scanner class is a powerful tool that allows us to take input from the user. In our example, we use the Scanner class to capture three essential pieces of information:
- The operator (specifying the operation to be performed)
- Number 1 (the first operand)
- Number 2 (the second operand)
The Switch Statement in Action
Once we have our user input, we can use the switch statement to determine which operation to perform. The switch statement is a versatile control flow mechanism that allows us to execute different blocks of code based on the value of an expression.
In our calculator example, the operator input is used to match against different cases in the switch statement. For instance, if the user inputs ‘*’, the corresponding code is executed, computing the product of the two numbers and printing the output. The break statement ensures that the switch statement is terminated after executing the relevant code.
Exploring Different Operators and Cases
But what about other operators, such as ‘+’ or ‘-‘? The beauty of the switch statement lies in its ability to handle multiple cases seamlessly. Depending on the operator input, different cases are executed, allowing our calculator to perform a range of arithmetic operations.
Putting it all Together
The result is a simple yet powerful calculator that demonstrates the capabilities of Java’s switch statement and Scanner class. With this foundation, you can build more complex applications that interact with users and perform sophisticated tasks.
Example Outputs
Take a look at the various outputs from our calculator:
Output 1
Output 2
Output 3
Output 4