# Convert the Infix Expression A * (B + C) / D to a Postfix Expression

To convert the infix expression `A * (B + C) / D` into postfix notation, we use the following rules:

1. **Operator Precedence**: Parentheses have the highest precedence, followed by multiplication (`*`) and division (`/`), and then addition (`+`).
2. **Associativity**: Operators like `*` and `/` are left-associative, meaning operations are performed left to right if they have the same precedence.
3. **Conversion Rules**:
    - Operands (like `A`, `B`, `C`, `D`) are output immediately.
    - Operators are pushed onto a stack.
    - Parentheses dictate the priority: Solve what's inside the parentheses first.

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### **Step-by-Step Conversion**

#### Infix Expression: `A * (B + C) / D`

1. Start with the subexpression inside the parentheses `(B + C)`:

    - Convert `B + C` to postfix: `BC+`.
2. Substitute the postfix for `(B + C)` back into the original expression:

    - The expression becomes `A * BC+ / D`.
3. Process the multiplication (`*`) and division (`/`):

    - `A * BC+` becomes `ABC+*`.
    - `ABC+* / D` becomes `ABC+*D/`.

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### **Final Postfix Expression**:

```
ABC+*D/
```