Javascript Calculator with multiple example
JavaScript Calculator
This JavaScript calculator is a versatile web-based application designed for performing arithmetic calculations. With its user-friendly interface and efficient handling of user input, it allows users to perform calculations quickly and accurately.
Key Features:
Basic Arithmetic Operations:
- This calculator supports fundamental operations like addition (
+
), subtraction (-
), multiplication (*
), division (/
), and percentage (%
).
- This calculator supports fundamental operations like addition (
All Clear Functionality:
- The "AC" (All Clear) button let a user resets the calculator, clearing all input and setting the display back to zero. This features helps a user for starting fresh calculation.
Erase Functionality:
- The "C"(erase) button allows users to delete the last character entered from right .
- This feature helps a user in correcting mistakes without needing to clear the entire input.
Dynamic Input Handling:
- The calculator displays the current input string in real-time, allowing users to see their ongoing calculations.
- It prevents multiple leading zeros and avoids adding multiple operators consecutively, ensuring valid mathematical expressions.
Result Display Control:
- After pressing the equals button (
=
), the calculator evaluates the current expression and displays the result. - If the equals button is pressed without a valid operation or if the last character is an operator, the display remains unchanged or is cleared.
- After pressing the equals button (
Percentage Calculation:
- The calculator can convert the current input to a percentage when the ("%") button is pressed, making it convenient for financial calculations.
Error Handling:
- The calculator handles errors by catching invalid expressions (e.g., division by zero) and resetting the display.
- In cases of invalid input, the display is cleared to avoid confusion.
Responsive Design:
- The calculator is styled using CSS to provide an aesthetically pleasing and modern interface.
- It is responsive and adapts to different screen sizes, ensuring usability on both desktop and mobile devices.
How It Works:
- Input: Users can input numbers and select operations using the buttons on the calculator interface.
- Calculation: Pressing the equals button (
=
) evaluates the input expression using the( "eval")
function and updates the display with the result. - Clear and Erase: Users can reset or erase their input as needed, allowing for flexible and dynamic calculations.
- Continued Operations: After obtaining a result, users can continue to perform calculations by entering a new number or operation, maintaining the flow of their calculations.

Example 02: