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+# Calculator Program for Multi-Base Arithmetic
+
+## How to Use the Calculator
+
+### Initial Setup
+- On power-up, the calculator starts in **DECIMAL mode**
+- LCD shows: `Mode: DEC` on line 1, `Inp: 0` on line 2
+- 7-segment displays the last digit of your input
+
+### Basic Operations
+
+1. **Entering Numbers**
+   - Press keys 0-9 for decimal digits
+   - In HEX mode, you can also use A-F (keys 10-15)
+   - In OCT mode, only 0-7 are valid
+   - In BIN mode, only 0-1 are valid
+   - Invalid digits for the current mode are ignored
+
+2. **Changing Base Mode**
+   - Press **Key A (10)** to cycle through bases
+   - Order: BIN → OCT → DEC → HEX → BIN...
+   - Current mode displays on LCD top line
+
+3. **Performing Calculations**
+   - Enter first number
+   - Press operation key:
+     - **Key B (11)**: Addition
+     - **Key D (13)**: Subtraction
+     - **Key E (14)**: Multiplication
+   - Enter second number
+   - Press **Key F (15)** for equals/result
+
+4. **Clearing**
+   - Press **Key C (12)** to clear all (input, stored number, operation)
+
+### Example Usage
+
+**Example 1: Add 5 + 3 in Decimal**
+```
+Press: 5 → B → 3 → F
+Display: Res: 8
+```
+
+**Example 2: Multiply 1010 × 11 in Binary**
+```
+Press: A (change to BIN mode)
+Press: 1 → 0 → 1 → 0 → E → 1 → 1 → F
+Display: Res: 11110 (30 in decimal)
+```
+
+**Example 3: Subtract F - A in Hexadecimal**
+```
+Press: A (cycle to HEX mode if not already)
+Press: F → D → A (10) → F
+Display: Res: 5
+```
+
+### Tips
+- The 7-segment always shows the last hex digit of your current input
+- Results stay in the current base mode
+- If result exceeds display capacity, only visible portion shows
+- After equals, the result becomes the new input for next operation