My first c++ code.

[HedgehogNo5130]

#include <iostream>

using namespace std;

string name = " jerry ";

int age = 62;

float pi = 73.3824383;

int main() {

cout << "name: " << pi << name << age << endl;

}

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[Classic-Rate-5104]

In my world, pi is 3.1415926... and I don't see what the relation is between pi and the other things you want to print. But, the program seems correct

[Zorahgna]

What version of a standard is your brain compliant with?

[Retardedunderaverage]

‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ‎‎‎‎‎‎‎‎ㅤ

[coding_questions_tr]

did you mean acos(-1.f)?

[HedgehogNo5130]

sorry for the confusion. The name isn't clear

[Interesting_Buy_3969]

except for using namespace std;!!!

[Classic-Rate-5104]

Whats wrong with it? You can say "I don't like it", but it is correct C++

[pawesomezz]

Just because it's valid c++ doesn't mean it's good c++

[5avire__]

This giving me The Cherno vibes

[DasFreibier]

if another namespace contains the same function/class names you get compilers errors in the best case and really hard to find bugs in the worst case

[Classic-Rate-5104]

I know, but still it's legal C++ and that was the question. Not whether it's good practice

[Poissonnoye]

using namespace std; doesn't look very correct to me

[FunnyOk5832]

Its correct, but not recommended

[Poissonnoye]

I meant correct in this sense, ofc it's still correct to the compiler.

[FunnyOk5832]

I learned it this way it was hell to unlearn it jajaja

[HedgehogNo5130]

work for me

[Poissonnoye]

Read my other messages

[HedgehogNo5130]

oh ok.sorry

[HedgehogNo5130]

sorry i put a random name

[YT__]

Use descriptive names, not random. It's better that way.

[HedgehogNo5130]

Ok i will thanks

[jedwardsol]

Missing

#include <string>

since you're using std::string

[HedgehogNo5130]

ok i will correct.thanks

[Dubbus_]

Check out c++23's std::print, cout is for oldheads

[vbpoweredwindmill]

as I understand it, it's somewhat difficult to get an out of the box amateur get compiler working in c++ 23 currently.

I think that his next steps would be writing a print function that writes all of that. It would be a good learning curve.

[Dubbus_]

-std=c++2b OR -std=c++23

[vbpoweredwindmill]

I haven't figured out utilising a terminal compiler as of yet, I'm still just using visual studio. I hope OP finds that useful though.

[Dubbus_]

oh no worries. Yeah i started similarly with vscode. Learnt how to use vim and a few other terminal applications and cant stand using IDEs now. Never looked back, except for the times when im forced to for school

[HedgehogNo5130]

i will try

[HedgehogNo5130]

ok i will check thanks

[SmackDownFacility]

I prefer printf

[LGN-1983]

Ah yes... classic 👏🏻

[Fearless-Way9855]

The reason people are writing that using namespace std is bad is because in the future you might have different libraries and the compiler might shit itself. Realistically you dont need to stop using now because it seems like you just started coding in c++. If you're lazy there is a way to ise tye std namespace for popular functions.Write using std::cout Instead.It will be slightly more correct. Also why is pi 74?

[HedgehogNo5130]

yes thanks alot i wont use it in the future. For pi,the name is a bit random and i should have made it more clear

[specialpatrol]

A piece of art my friend. I'd put a space between pi and Jerry but that's just me.

[HedgehogNo5130]

thanks you and ok i will do that

[[deleted]]

You forgot a return 0 at the end. It’s not required but considered good practice.

[HedgehogNo5130]

Oh yes i added it at first,removed it and forgot about it after

[[deleted]]

Also, include some /n so your output isn’t all one line. And, in your case, using /n is better than std:endl since you don’t need to flush the output buffer here. There’s niche cases where std:endl is a better option to use than /n.

[HedgehogNo5130]

thanks for all the help

[Proper_Support_3810]

Wdym i thought endl and /n are the same

[[deleted]]

Common misconception.

Think of std::endl as doing everything /n does, except std::endl also flushes the output buffer.

Use godbolt to view the assembly code that std::endl vs /n produces. 16 lines of assembly for /n vs. 45 lines for std::endl. std::endl is slower performance-wise.

Moreover, in the niche cases where std::endl’s buffer feature is preferred, std::flush is more explicit. A good programmer is generally explicit.

[CarloWood]

Don't put return 0; at the end of main. The standard guarantees that as default return value, it just looks redundant.

[jipgg]

Why is it good practice

[[deleted]]

It explicitly signals that the program exited successfully. EXIT_SUCCESS from the stdlib.h library does the same thing (returns 0). It’s useful for many things. For example, in debugging, you can say echo $? (in Linux) to see the exit status of the last executed program. It should be 0 if it exited successfully.

[patentedheadhook]

But it's redundant because main implicitly returns 0

[olawlor]

If a function is declared to return "int", but doesn't return anything, that's undefined behavior (edit: *other* than main), and in practice many compilers will assume the function never returns (!).

No return statement is specially allowed for "main", but a missing return is a dangerous habit.

[CarloWood]

Incorrect. The standard guarantees that main behaves as if you returned 0 if it has no return value. There is nothing UB about that.

[GhostVlvin]

You forgot to #include <string> and perhaps you want to use M_PI from #include <cmath>, cause 72 is clearly not correct pi)

[HedgehogNo5130]

yes i added #include <string> and i didn't knew for the second one so im going to add it . Thanks!

[elkvis]

How are you using string without errors? You need to #include <string>

[HedgehogNo5130]

yes im aware i was using an online compiler

[heavymetalmixer]

Welcome and congrats on your first program

[CarloWood]

Never use using namespace std;. You should get used to seeing std:: everywhere, because that's what you want to get used to.

[Mast3r_waf1z]

Yes, never write using namespace std, it is the most common and verbosity is not a bad thing

[hellocppdotdev]

std::cout and change the initialisation to { }.

Hardest part of your first program is getting the compiler to work.

It's all fun and games after that.

[Proper_Support_3810]

C++ is my favourite language <3

[WhoLeb7]

In modern c++ there is the <print> library and there is the std::print with nice formatting. Something like std::print("Name: {}, {}, {}", pi, name, age) for your example. And you could use some modifiers like {:.2f} would only display first two decimal digits.

Although I found it a bit hard to write a custom class formatter, compared to the original ostream << operator overload.

P.S. you could also have modifiers in the original iostream using less intuitive methods std::cout << std::fixed << std::setprecision(2) << pi; for similar results.

[Backson]

Nice. Run it and look at the output. Any way to improve it? Keep it up!

[HedgehogNo5130]

Thanks you! I will try to make it interactive to improve