How to do pointer to function in C?

Question

0.00/5 (No votes)

See more:

I want to do point to function that return me a pointer
Like this function

C#

int *test(int x)
{
	int y=x*x;
	int *p=&x;
	return p;
	}

What I have tried:

I tried this option int main but i get error all the time

C#

int (**t)(int x);
		t=&test;

C#

int (**t)(int x);
		t=*test;

C#

int (**t)(int x);
    t=&(*test);

C#

int (**t)(int x);
		t=*(&test);

Posted 1-Dec-16 13:52pm

komokom

Updated 1-Dec-16 16:53pm

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

cvogt61457 · Accepted Answer · 2016-12-01T14:08:00

Solution 1

Try this
int* (*myfunc)(int x);

myfunc = test;

Call as
int* ret = myfunc(3);

It's been a while for me but give this a try.

Note: You're returning the address of an parameter variable. It's gone once you've returned to the calling routine. Big Error !!!

Posted 1-Dec-16 14:08pm

cvogt61457

Comments

komokom 1-Dec-16 20:22pm

You mean its call by referns?
If you can explain me how its work i will be glad

Patrice T · Accepted Answer · 2016-12-01T16:53:00

Advice: Take time to learn properly the language, here is a very god lecture to learn C and C++, answer included.
Here is links to references books on C and C++ by the authors of the languages. Note than C is the ancestor of C++, so knowing C is always useful with C++.
The C Programming Language - Wikipedia, the free encyclopedia[^]
https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2.pdf[^]
http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf[^]

C++ Programing Language[^]