C++ POINTERS (2025) - What is a void pointer? (for beginners) PROGRAMMING TUTORIAL

[@CodeBeauty]

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[@remysalone]

I am now a university freshman from China majoying in Network Security. I started to learn C++ when I was in high school but gave up due to its complex concepts. Now that we have to learn C++ in my major, I turned to this video to help. Your explaination is really clear and the words in this video is amazingly understandable for a Chinese whose mother tongue is not English. Really thanks you a lot and wish your channel will become better.

[@francescofaccodelagarda5408]

Thank you SOooooo much, Saldina!!! I used to be a wizard in C++ (back in the 1990's ..) ... havent used it for 30 years and you are the best "refresher" I've seen! A pleasure to follow you: charming, whitty, clear .. well done!

[@Apost821]

I am from Ethiopia . I am second year Hawassa university student .I woud like to say , thank you for your great helping for us.I get great knowledge from you

[@roninhacked2045]

hey code beauty your tutorials are so understandable so please can you bring about competitive programming course

[@justbake7239]

Why haven't I seen this channel sooner. Your tutorials are so helpful thank you!!!!

[@hussainaqeel7371]

Hey guys! I have a tip, instead of passing a type parameter and checking for different possibilities with a switch statement, you can use a C++ "template", they allow you to pass type arguments to functions! template // `T` will be the data type void print(void *ptr) { cout

[@dealvin]

The "" Is redundant, compiler understand types. Good advice, bro

[@AK-ey5ms]

Why would you do something like this? template void print(T* in_ptr) { std::cout

[@kolbe6436]

Nice

[@WolfsdenxD]

Thank you so much, you've taken away a lot of my confusion about pointers.

[@stefanfrei6199]

i assume this code is only theoretical, and in production you would use function overloading? void print(int* val) { cout

[@maryamzia7831]

it will show the address .

[@riddlewrong]

cout

[@ariverasandoval]

You are very good at teaching . Thanks a lot

[@ramazanhusaini3531]

i do appreciate your work for making clear and understandable videos about pointers

[@JazzInATinCan]

Have watched a couple of the pointers videos now - great content!

[@kttthn]

Thank you so much for your work!!!

[@dandon.3667]

You are the best teacher 💙💙

[@dealvin]

Struct and void pointers are powerfull!

[@TehCruiser]

We can simply use the keyword auto to print a pointer of any type, like: #include void printPtr(auto* ptr) { std::cout

[@cmnikola]

i been trying to find this comment!

[@fatimam-z8d]

#include template void printPtr(T* ptr) { std::cout

[@sergio_sciuto_conti]

Very good explanation, brilliant!

[@CodeBeauty]

🙏💙

[@fadi0802]

Very well explained!

[@itzikovadia851]

Thanks u are excelent teacher

[@jrdlcz]

Thank you for sharing this video!❤

[@sheikharooj5762]

You are an asset .. thank you so much❤

[@mongalmoy_karmakar]

Thank you so much for this amazing series of pointers.

[@RustyRustacean]

Hi, I learned a lot about C++... thanks! But i don't get something, how can everything I learned be useful, could you make some mini-projects about real world applications in the most realistic way possible (So that I get the idea about what is it to work like a C++ programmer)

[@jason_skillman]

Thanks that cleared up all of my questions on void pointers 🎉👍

[@adrienc8716]

very clear ! Thank u very much

[@projetistadegambiarras]

excelente tutorial muito bom .

[@sousavann]

Thank you! It's easy to understand. Can you also make tutorial for different programming languages as well like Java, Python, Javascript, etc. ?

[@lucianbetke]

Hübsch und klug, gefällt mir.

[@softwaresolutions3111]

Love the way you teach

[@tuazulyrojoeljean]

Thanks, this vid is actually so well explained

[@mytuberam]

Is it possible to avoid the 2nd argument 'char type' and instead get the type from the first argument somehow?

[@manjeet_rajput_95188]

Hey there, I think the template performs a well and easy way to write code this problem.

[@gusromul3356]

girl, you rock! congrats to you and your team... if there is such

[@CodeBeauty]

No team, only me 😅☺️ Thank you 🙏

[@gusromul3356]

@@CodeBeauty whoa... then you rock and roll ;)

[@unisonunison9789]

Hey nice video! i just wanted to mention that on 8:34 i had problems with understandings the difference between *((int*)ptr) and (int*)ptr. becasue it was too fast for me. But in the end i unnderstood it. Here is a code for anyone who are still struggling: int number = 42; // Initialize an integer variable 'number' with the value 42 void* ptr = &number; // 'ptr' points to the address of 'number' int* intPtr = (int*)ptr; // We cast 'ptr' to an 'int*' pointer int value = *intPtr; // We dereference 'intPtr' to obtain the value '42' so how i understood it is that *((int*)ptr) casts the datatype to an intiger and to acces the value you need to write the * ((.... in the end

[@lukesky9627]

*((int*)ptr) means its cast into an int pointer (the inner parentheses containing "int*") and the entire thing is dereferenced, thats why there are the outer parentheses and the "*" at the beginning. Write it out to the console and you will see the difference between *((int*)ptr) and (int*)ptr.

[@kelvinwilliams2908]

I have 2 questions - (1) On lines 4,5,7 & 8 you use "Ptr" but on line 10, you use "ptr", why? (2) At 5 mins into the video, you have 2 funtions, one for "int" and the other for "char" and when you run the program it outputs number 5 and letter a which is fine. Then around 11:30 mins into the video you have the "void function" which does the same thing - but the code for the two original functions is still there so how does the computer know which functions to use because now there are three functions to chose from. What is it that I have missed here?

[@everline_builders]

Thank you! Excellent video! But can we use auto* in lieu of void* ?

[@tayabfarooq7544]

@code beauty! in one of your videos you had shown the method of sorting variables inside an array ....... Kindly provide the link to this video as soon as you can.... I had ever watched it but now I could not find it!

[@sv3glx]

Once again.. Awesome!

[@strategyschool]

So how about using template before writing function an use for the arguments?

[@fatiqhussnain8399]

saldina ! i appreciate your work but plz make a detailed video on link lint in c++

[@Wexler111]

Huge thanks for these videos

[@hell0kitje]

Im struggling with pointers and arrays, hope it will be covered in future

[@CodeBeauty]

Yep, I will make a video about that as well 😊

[@menu6750]

great lesson..🙂 Should i make "switch case" for every data types..i want to pass to the void pointer..

[@aditisingh4952]

Hey Saldina ! why did you make the type char??

[@hama_kurdish2434]

You can use template after that create a function to hold every data type.

[@viniciusmelo984]

11:28 I believe the "break;" statement is missing

[@MihaiDumitrescu12]

As a joke I only understand "avoid pointer" :)

[@imtiyazalam_IIItian]

thank you maam for such nice explanation....love from INDIA

[@Dani-mp2we]

using void pointers is a better solution than function overloading? in terms of performance

[@AbdulRehman-ch4kw]

Thanks... This was Very Useful :)

[@liquidred257]

is the break command in the switch necessary, because won't type fail the other cases if it passes one?

[@AviPars]

Do you have a video on fn pointers

[@agnisri1201]

Finally i rewire my brain ❤

[@noonegates2328]

isn't it better to use: case 'i': cout

[@degenpokerGG]

That's correct. While both approaches technically accomplish the same task, using static_cast is generally preferred in modern C++ code because it provides stronger type checking and better readability. It's a good practice to use the type-safe features provided by the language whenever possible.

[@matthewurke5192]

Hey, question. You said something about a logic error. But if you type out each case for each type, could the program run anywhere you need it to in your code, by reference the void code again at lets say line 300, and line 3000?

[@CodeBeauty]

Yes, you can invoke "print" function as many times as you want. Are you familiar with the concept of functions? I did a short series about functions in C++, that can help you understand this better. And a logical error is related to the error that your compiler is not able to see, but it will cause your program to behave in an unexpected way. For example, a logical error can be if you try to calculate how many seconds there is in a day, and instead of calculating 24 (h) * 60 (min) * 60 (sec) you do something else. Your compiler will not know, but you will get the wrong result.

[@emaus8344]

I was trying to find out what is IntPtr datatype and came upon your video. Is function that you wote explanation for IntPtr or have I got something wrong?

[@neck-o]

I just realized that you don't even need a switch statement to determine the datatype of the passed pointer. Just declare a template above the function: template , and use whatever datatype passed with the function as the pointer to cast as: func(&anInteger), then inside the function: cout

[@Peter-lq1xj]

Amazing

[@michaeleddy927]

What is the switch function for?

[@AlexTrouman-oi1yp]

in switch what about default !!!!!??

[@hefhef54321]

Here's an alternative way for doing this but with generics and templates ``` #include using namespace std; template void print(void* _ptr); int main() { int n = 5; char l = 'a'; print(&n); print(&l); system("pause>0"); } template void print(void* _ptr) { cout

[@madhusankawijerathne8435]

Thank you beauty!

[@alejandromackay3074]

Break is missing in the switch-case structure.

[@yahiamohamed4764]

you can use an auto type pointer so it can handle any type

[@miguelferreira-xy7gq]

merci thank you

[@remimonsel9944]

instead of using a void pointer, can't we use a template and typedef to create a sample function ? or my idea is not so good for some reasons ?

[@arisgacha296]

very good.

[@muadrico]

Looks more like a C approach than a C++ solution. In C++ you would make “print” a templated function or use a std::variant as the type. Usually you don’t need “void*” in modern C++. Also, using C style typecasting usually is a code smell in C++.

[@Novecento]

Yeah you're right, but I think the point of this video is to teach beginners what void pointers are and how to use them and I think she did a great job at that in only 15 minutes. Void pointers are just a tool, a legacy tool but I think beginners should know them because probably they'll have to deal with legacy code more often than they would think.

[@muadrico]

@@Novecento Agreed.

[@carloni1997]

I agree that void pointers are not usually needed. However, I do wonder why you would call C style cast a code smell? If you know what you're doing, a cast is a cast. Right? char carr[4]; int *ptr = (int*)carr;

[@muadrico]

@@carloni1997 It can lead weird behavior, when used for casting objects in a class hierarchy and the compiler can not spot the error whereas if you use the correct C++ cast, the compiler will tell you the error. Here is a nice article about the different kind of casts. arne-mertz.de/2015/01/a-casting-show/

[@carloni1997]

@@muadrico I agree it can lead to weird behavior. Simplest possible weird thing would be: float fval; int *ptr = (int*)&fval; (*ptr) = 5; Weirdness here would come from a fact floats are stored differently than integers. I also like article you shared. Examples and explanations. Thank you. It was a worthy read. And it gave me a little bit to think, so with that in mind, I would say this: C++ casts are used for safety, since they can trow exceptions and compiler errors. But if you really know what you're doing, C style casts are totaly legit. And if you really, really know what you're doing, C style casts shouldn't lead to weird behavior. Oh, and my favorite part was: Downcasts in class hierarchies. P.S. B2* pb2 = (B2*)((void*)&d); gives me the same result as a static_cast

[@muhammadumernadeem725]

11:25 Break statement is missing

[@CodeBeauty]

Correct 😊

[@Fullstackdev-]

thanks

[@hoangphan2498]

nice tks a lot

[@serollakrish3833]

hello mam can explain about null pointers, where and when we use null pointer, main reason to use null pointer ...... plz mam

[@zareenabanu6425]

11:27 question Answer: Break;

[@bigmac963]

Hi, please can you do a video tutorial on how to build a simple game in c++ console. Thanks!

[@StabbyMacStabStab]

Am I wrong for thinking that it would be better to just use a template function to deal with the different data types being passed in instead of having to use a void pointer with a bunch of switch statements?

[@vivekdixit9208]

I have just started to learn C++ from your first video .. I know some basics of C so can guide me the sequence of your tutorials and how much days it will take to understand the codes written in C++. It will help a lot .. thanks in advance and thanks for doing such great videos .

[@CodeBeauty]

In my opinion, in programming, there is no final goal to achieve where you can say "Okay, I know enough, I'm good now" This is the kind of profession where you learn every day. So take it easy, be consistent, but don't be hard on yourself, and enjoy the process of learning each day. Before you expect it, you'll be able to look back and say "Well, I feel like reading/writing code became like reading/writing English" I remember a few years ago when reading code felt like trying to understand hieroglyphs. I couldn't wait to become "good" and not have to struggle with that anymore, and then I decided to stop stressing about it and focus on improving things that I felt were my weak spots, and over time, that feeling of not understanding code or not being able to write it just disappeared. I can't tell you how long it will take, I don't think anyone can, but I can tell you that if you invest 1-2 hrs every day for a year, you'll be able to see huge progress. And you can even take weekends off. 😊

[@paulcook748]

Nice and clear, but honestly, void pointers are not a "beginners" subject in C++ because the only time one should be using them is in highly advanced situations. I appreciate you are trying to construct an example that is easy to follow, but it concerns me that a beginner might interpret this as a good way to design code. This is the absolute antithesis of C++'s approach to strong typing.

[@lizzy_trevisan]

did we forget the break between cases?

[@typedef_]

Is it good practice to use pointers in C++ ? To me, an "object" implicitly removes the need for pointers. I've never used C++, but I have used C# a lot and never got in a situation where a pointer was needed...

[@findikbabi]

11:25 We are missing a break.

[@CodeBeauty]

Yep. Glad to see that you are still here 🤗

[@luser5381]

Doubt 1: function overloading with different pointers in the signature? Doubt 2: Templates with pointers? like, say typename t which results in parameter void fn(t* var) ???

[@yankobzykant5579]

break statement was missing inside switch case

[@saifmos6516]

but why when i do extra case 'd':cout

[@isajameh2789]

Thank you beauty.

[@ravirajac]

I would suggest to use template void printData(const T &value) { std::cout

[@rrokluli7392]

It would be better if you use a Dark Theme for VS

[@CodeBeauty]

Some people told me that they have to watch the videos on lover resolutions and that it is much easier to see the code when it is on a light background instead of a dark one. In regular life, I prefer a dark one as well, but because of the reason that I mentioned I use light for videos 😊

[@WistrelChianti]

singing "it's my memory and I'll cast it to what I want to" (referencing the Leslie Gore song)

[@MGD320]

what song?

[@WistrelChianti]

@@MGD320 it's my party

[@SulixD]

this is more C style really than C++ , in the future consider teaching templates to solve this same problem where you used void pointer.

[@onurolce]

11:32 I did not watch after that second. I guess you need to finish CASE with BREAK; and also you also need to add DEFAULT in SWITCH function. At lease we are doing it in Java :)

[@naimcool36]

in c++ u dont need default

[@CodeBeauty]

You will not get an error if you don't have a "default", but if you want to cover some default situation, that is what "default" is meant for 😊

[@onurolce]

@@CodeBeauty "if any of these conditions not happens then do it..." I guess you are telling this to me in your style, I like it :)

[@Superman-tm8cp]

Why can't we use templates instead of switch? It works better and takes less time to write the code

[@markosbasha6387]

It’s Christmas time, Abebe and Alemu woke up one day and found N presents under their Christmas tree, each present has a unique number from 1 to N, since Abebe love even numbers and Alemu love odd numbers they decided that Abebe will take all the presents that have an even number written on it and Alemu will take all the presents that have an odd number written on it, but they don’t know how many presents they will get each and they are both lazy to count the presents right now so they asked for your help to tell them how many presents each of them will get using a function called “Christmas()“...please help me with this question ....U are my Excellent lecture ❤❤

[@ashenhewavithana9479]

Hi, this is my code for printing out a letter using functions and pointers, but I am getting an error - "invalid conversion from 'const char*' to 'char*' -fpermissive". Could you please help me solve this. Thanks #include using namespace std; void printNumber(int* numberPtr){ cout

[@hbbss8684]

why not use a template instead?

[@muhammadmuiz1487]

Break point is missing

[@kelvinwilliams2908]

Regarding my two questions 1 day ago I have now worked out the answer to my second question but I am still unsure about the first.

[@cmnikola]

bro its not important name, two years have passed, how are you?

[@huraqandavid6727]

The part missing in the case is "break;"😅. Im not sure xD let me continue to video

[@sakthivigneshvar4428]

Mam break keyword is missing

[@CodeBeauty]

Yep, that is the correct answer. 😊

[@tvt2546]

save life C++ channel

[@atultiwaree6023]

It's Break & Default.. Hope So :)

[@nikhilkumar-ww4wh]

i love u maam