Function Pointers

Introduction

Function Pointers builds on this idea: Store call targets for callbacks and dispatch tables. You will see the syntax, a runnable snippet, and habits that keep programs safe.

Understanding the topic

What you will learn Store call targets for callbacks and dispatch tables.

How it fits in C Function Pointers shows up in real programs as declarations, expressions, and library calls — always compile with warnings enabled.

Try the sample Copy the example, build it with gcc or clang, then change inputs to see how output shifts.

Next steps Reuse Function Pointers in a small exercise before mixing it with pointers, arrays, or file I/O.

• What you will learn — Store call targets for callbacks and dispatch tables.
• How it fits in C — Function Pointers shows up in real programs as declarations, expressions, and library calls — always compile with warnings enabled.
• Try the sample — Copy the example, build it with gcc or clang, then change inputs to see how output shifts.
• Next steps — Reuse Function Pointers in a small exercise before mixing it with pointers, arrays, or file I/O.

Step-by-step explanation

1. What you will learn — Store call targets for callbacks and dispatch tables.
2. How it fits in C — Function Pointers shows up in real programs as declarations, expressions, and library calls — always compile with warnings enabled.
3. Try the sample — Copy the example, build it with gcc or clang, then change inputs to see how output shifts.
4. Next steps — Reuse Function Pointers in a small exercise before mixing it with pointers, arrays, or file I/O.

Informative example

Example program:

#include <stdio.h>

int main(void) {
    printf("Demo: Function Pointers\n");
    return 0;
}

Demo: Function Pointers

Execution workflow

Best practices

• Enable warnings: gcc -Wall -Wextra -std=c11 source.c -o app
• Give every variable a defined value before it is read.
• Stay inside array bounds — C will not stop you from over-running a buffer.

Common mistakes

• Reading uninitialized storage — behavior is undefined.
• Dismissing compiler warnings instead of fixing root causes.
• Ignoring NULL returns from malloc, fopen, and similar APIs.

Hands-on exercise

Practice problems:

• Code a tiny demo of Function Pointers
• Mix Function Pointers with a concept from the previous module

Summary

Function Pointers: Store call targets for callbacks and dispatch tables.