Simple 4-function calculator with keyboard and button input
This basic 4-function calculator supports addition, subtraction, multiplication, and division with a clean button interface. It handles decimal input, consecutive operations, division by zero, and includes clear entry (CE), clear all (C), plus/minus toggle, and backspace. You can also use your keyboard for input.
Click the number buttons to enter values, click an operator (+, −, ×, ÷) to select an operation, then enter another number and press =. Use C to clear everything, CE to clear the current entry, and the backspace arrow to delete the last digit. The ± button toggles between positive and negative values.
Division by zero is undefined in mathematics. The calculator displays "Error" if you attempt to divide a number by zero. Use the C button to clear the error and start a new calculation.
This is a simple 4-function calculator that performs operations sequentially in the order they are entered, not following PEMDAS/BODMAS. For example, 2 + 3 × 4 equals 20 (not 14). For order-of-operations calculations, use a scientific calculator.