Understanding and Using Function Pointers in C

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Understanding and Using Function Pointers in C // A lot of my students struggle with function pointers. Mostly, they have a hard time reading the declarations. So, hopefully, this video will help make things a bit clearer.

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Welcome! I post videos that help you learn to program and become a more confident software developer. I cover beginner-to-advanced systems topics ranging from network programming, threads, processes, operating systems, embedded systems and others. My goal is to help you get under-the-hood and better understand how computers work and how you can use them to become stronger students and more capable professional developers.

About me: I'm a computer scientist, electrical engineer, researcher, and teacher. I specialize in embedded systems, mobile computing, sensor networks, and the Internet of Things. I teach systems and networking courses at Clemson University, where I also lead the PERSIST research lab.

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I wish I had teachers like you in college.

sjittube

I prefer to typedef the function declaration, like this:

typedef int operation_func(int, int);

Then declare a function pointer variable with

operation_func *op;

That way you avoid the awkward parenthesis syntax and you don't hide that fact that 'op' is a pointer inside the typedef.

sverkeren

This should call "How to show mastery in a lesson". Thanks for the video.

ulysses_grant

Watching this a year later, and I must say this was really clean. Especially using the typedef. Thank you for this.

TheChemicalBassist

The first time I watched this video, I couldn't comprehend the content. After going back to basics on pointers and function calls, this was very nicely explained. The typedef part makes a LOT of sense seeing the mess created by function pointers as arguments. Thanks a lot professor!

akhileshb_

Fantastic video! You explain function pointers so clearly and break it down. Probably saved me 30 minutes of googling :)

nathanbrown

Honestly comming from C++ I always had trouble understanding C style function pointers but seeing them like this makes it so much clearer and less intimidating, thank you!

levidekoning

Ya i was reading the man page for pthread_create and one of the parameters is:
void *(*start_routine) (void *)
I had no idea what this was at first.
From your video I know now that it is a pointer to a function (start_routine) that takes void * as a parameter and returns a void *.

seal

You sir are amazing. In 4 minutes you easily explained a function pointer as well as a typedef with a func pointer. Subbed and liked. Bravo.

TheDa

This channel is way too underrated. Thank you so much again! Professor Sorber, you've helped me a ton in my undergrad and now again in grad school!

grevierx

1. I tried this declaration:
void (*fun_ptr)(void);

2. At assignment:
fun_ptr= &task1;
fun_ptr = &task2;

3. Then at call location:
if(lock){fun_ptr();}

worked !

PerchEagle

Thanks for the video! It was very helpful! My first exposure to "pointers to functions" was in C++ and the syntax created a long-lasting mental block for me. lol Thanks for posting!

TheCocoaDaddy

use of typedef for function pointer is Highlight for me. Thanks Jacob.
Before watching this video - Use of typedef is to create give data type a new name. mostly used with char, int, float, double, struct, union.
After watching this video - we can use typedef for function pointer as well.

Request for everyone if they have any new prospective to look at typedef then please comment for better understanding of everyone 👍.

pipaliyakuldeep