sizeof returns size in chars (not in bits), in C I believe 'a' is int, which has have sizeof 4

O.o Thanks

O.o Thanks

There are more differences by the way, not every C code can be compiled with C++ compiler

There are more differences by the way, not every C code can be compiled with C++ compiler

In syntax?

Is there any difference between C and C++ (same code)

Yes Some code from one language may not be compiled in other one

But when I was compile main.c file by G++ Then I decompiled by some apps The app said it's a C program not a C++ program

But when I was compile main.c file by G++ Then I decompiled by some apps The app said it's a C program not a C++ program

Decompiler is r2

In syntax?

In features, C and C++ diverged long time ago and developed separately. E.g. C++ doesn't have variable length arrays (some C++ compilers can support is as an extension but it's not portable), also designated initializers arent available before C++20 but available in C.

Thank you a lot

But the last question Why C++ does not support of good futures that C have?

But the last question Why C++ does not support of good futures that C have?

👌

But the last question Why C++ does not support of good futures that C have?

What do you mean by good fututes?

Which one do you recommend to start guys, c or c++?

Which one do you recommend to start guys, c or c++?

C++

C++

Tnx

Which one do you recommend to start guys, c or c++?

I started by C++ But it's hard for beginners

But the last question Why C++ does not support of good futures that C have?

Because it used ANSI C by the means of compatibility. Then the languages split in their development

Hi guys, when I call this function, how can I use the value it returns?

FILE * openFile(char *nameFile, char *mode){ FILE *fp = fopen(nameFile, mode); if(fp == NULL) exit(-1); return fp; }

Hi guys, when I call this function, how can I use the value it returns?

FILE* f = openFile("asdf.txt", "r");

Although I dunno why it exists tbh

Shouldn't you be able to handle the situation when a file doesn't exist?

😂

Char: 8 bits Int: 16 (when specified) or 32 Float: 32 Double: 64 Long double: 96

long double is 80 bits wide not 96 on the most platforms

Char: 8 bits Int: 16 (when specified) or 32 Float: 32 Double: 64 Long double: 96

And int is usually 32 but to be exact it isn't really specified like that. Char defines word - usually it's 8 bit but it can be anything, int is defined as something bigger than short and smaller than long and similarly with float and double About floats it's usually defined by IEEE754 and looking at standard you have 256 bit version of float, so you need to look at specific implementation

Shouldn't you be able to handle the situation when a file doesn't exist?

I am completing a project and I need to use the functions that are already present.

Instead for the closing function, how should I call it?

FILE * closeFile(FILE * fp) { if (fp != NULL) fclose(fp); return NULL; }

Instead for the closing function, how should I call it?

Lol they are literally with same signature

Just call one over the other

Lol they are literally with same signature

closeFile(f)?

closeFile(f)?

Yeah

Second day in C? :P

Second day in C? :P

More or less

What graphics library does one recommend for C(99) and what are it's strengths/weaknesses? Maybe someone could point me in the right direction

What graphics library does one recommend for C(99) and what are it's strengths/weaknesses? Maybe someone could point me in the right direction

Use case?

What graphics library does one recommend for C(99) and what are it's strengths/weaknesses? Maybe someone could point me in the right direction

I recommend not to use C

Tell me more

What graphics library does one recommend for C(99) and what are it's strengths/weaknesses? Maybe someone could point me in the right direction

sdl2, sokol

Tell me more

What more? You didn't say what are you going to do

I recommend not to use C

why not?

why not?

Because it's poorly designed language that encourages bad practices

Well, thank this "poorly designed language" for having a computer nowadays lol

Well, thank this "poorly designed language" for having a computer nowadays lol

It was a breakthrough for the time, but not now

Use case?

I want to learn some more C and do essentially a 2d plot which changes over time.

I appreciate your advise on choosing a programming language as a beginner

Thank you all🙈😍🙌

What graphics library does one recommend for C(99) and what are it's strengths/weaknesses? Maybe someone could point me in the right direction

GTK is all C as far as I know. It's overkill for anything basic though.

I want to learn some more C and do essentially a 2d plot which changes over time.

Consider using something like this https://matplotlib-cpp.readthedocs.io/en/latest/. It's a cpp wrapper of python library.

Consider using something like this https://matplotlib-cpp.readthedocs.io/en/latest/. It's a cpp wrapper of python library.

> c++ > wrapper of python library

https://github.com/alandefreitas/matplotplusplus This is better

I want to learn some more C and do essentially a 2d plot which changes over time.

If you don't need to update the plot often, maybe using C to generate a gnuplot script will be sufficient.

The string array is a vector of pointers, and probably not pointing to valid memory. The pointers should be aimed at either a static char buffer or a dynamically allocated char buffer. The char *argv[] argument to main(int argc, char *argv[]) has space allocated by the operating system but your string array will have to be prepared yourself. Somebody asked about thread cleanup? https://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_cleanup_pop.html

Thanks.

#include <iostream> using namespace std; class triangle { public: int side1, side2, side3, perimeter; void setSides(int a, int b, int c) { side1 = a; side2 = b; side3 = c; } int getPerimeter() { perimeter = side1 + side2 + side3; } }; int main() { triangle obj; obj.setSides(1, 2, 3); cout << obj.getPerimeter(); return 0; }

Why the output is 127 instead of 6?

The next program displays a different number each time I run it. Why?

#include <iostream> using namespace std; class triangle { public: int side1, side2, side3, perimeter; void setSides(int a, int b, int c) { side1 = a; side2 = b; side3 = c; } int getPerimeter() { perimeter = side1 + side2 + side3; } }; int main() { triangle *ptr= new triangle; (*ptr).setSides(1, 2, 3); cout << (*ptr).getPerimeter(); return 0; }

#include <iostream> using namespace std; class triangle { public: int side1, side2, side3, perimeter; void setSides(int a, int b, int c) { side1 = a; side2 = b; side3 = c; } int getPerimeter() { perimeter = side1 + side2 + side3; return perimeter; } }; int main() { triangle obj; obj.setSides(1, 2, 3); cout << obj.getPerimeter(); return 0; }

Bro write return parameter statement inside class getParameter() member function

Bro write return parameter statement inside class getParameter() member function

Oh Yes Thank you 😊

Oh Yes Thank you 😊

✌️

And what will you do with an arbitrary pointer that user inputed?

https://pastebin.com/rAGiVWY0 I guess I'm fine now...

Int main(){ int a=5, b=0; b = ++a + ++a; printf("%d\n", b); } Why 2 different compilers output different results? 13 and 14?

Int main(){ int a=5, b=0; b = ++a + ++a; printf("%d\n", b); } Why 2 different compilers output different results? 13 and 14?

Because it is undefined behavior

Because it is undefined behavior

Why is that so?

Why is that so?

Order of execution is not guaranteed

Order of execution is not guaranteed

Wow. Thanks.

Order of execution is not guaranteed

Much appreciated

std::string *getName(const string& attribute_name) const { if(condition)return &attributes[i]; return nullptr; }

std::string *getName(const string& attribute_name) const { if(condition)return &attributes[i]; return nullptr; }

Lol what's that

std::string *getName(const string& attribute_name) const { if(condition)return &attributes[i]; return nullptr; }

how i can get value of this pointer function ?

A pointer to std::string.. what a nonsense

how i can get value of this pointer function ?

What do you mean?

A pointer to std::string.. what a nonsense

why ?

why ?

Because no one writes code like this

It's bad

It's bad

What should be the correct method of return string ??

Pointers should not be used as optional type

What should be the correct method of return string ??

In this case std::optional<std::string>

Pointers should not be used as optional type

int *p ;

int *p ;

So?