---
title: "Static versus dynamic binding trade-offs"
subject: "Object Oriented Programming"
chapter: 7
key: "semester_3/object_oriented_programming:static-vs-dynamic-binding"
source: https://www.bctengineer.com/q/semester_3/object_oriented_programming/static-vs-dynamic-binding
site: BCT Engineering
---

# Static versus dynamic binding trade-offs

Object Oriented Programming · Chapter 7: Polymorphism and Dynamic Binding

- Asked in: 2068 Chaitra, 2 marks
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_3/object_oriented_programming/static-vs-dynamic-binding
- Whole chapter: https://www.bctengineer.com/md/semester_3/object_oriented_programming/chapter-7

## Question

What are the primary trade offs between static and dynamic binding?

## Short answer

Static binding fixes function calls at compile time (faster, no overhead), while dynamic binding resolves them at run time via vtables (slower, uses extra memory). The trade-off is between efficiency and the flexibility/polymorphism dynamic binding provides.

## Answer

**Static binding** (early binding) fixes the function to be called at compile time; **dynamic binding** (late binding) fixes it at run time through virtual functions.

| Point | Static binding | Dynamic binding |
|---|---|---|
| Speed | Faster, direct call | Slower, call through vtable |
| Memory | No extra memory | Extra vptr per object and a vtable per class |
| Flexibility | Low, type fixed at compile time | High, supports polymorphism |
| Error detection | Early, at compile time | Some errors appear only at run time |
| Inlining | Possible | Generally not possible |

So the trade-off is **efficiency and early checking (static)** against **flexibility and extensibility (dynamic)**.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Which is faster, and why?
   A. Dynamic binding, because it is flexible
   B. Static binding, because it makes a direct call
   C. Both are the same
   D. Dynamic binding, because it inlines
   Answer: B. Static binding is a direct call; dynamic binding goes through the vtable. (Key point: Speed)

2. What extra memory does dynamic binding need?
   A. A heap for each function
   B. A vptr per object and a vtable per class
   C. Nothing
   D. A copy of the base class per object
   Answer: B. Each polymorphic object has a vptr and each class has a vtable. (Key point: Memory cost)

3. What is the main trade-off?
   A. Static: flexibility; dynamic: speed
   B. Static: efficiency and early error checking; dynamic: flexibility and extensibility
   C. Static: runtime errors; dynamic: compile errors only
   D. No trade-off
   Answer: B. Static binding gives efficiency and compile-time checking; dynamic binding gives flexibility. (Key point: Trade-off)

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