Topic: C++ Thread

Please post anything about C++ and lots of tutorials!

I'm learning C# but I can still tell you some about C++. What skill level are you? Do you have input/output? How many commands do you know?

I know about 2 commands (I started 3 days ago.) but you probably should let me restart please also explain the commands well.

Let's make a Hello World program.
1. If you are not using Visual C++, skip this step. Include the "stdafx.h" header. This allows everything else to be done.

#include "stdafx.h"

2. Then, we have to include the "iostream" library, which includes input, output, etc.

#include <iostream>

3. Everything in C/C++/C# and such has to be inside something. We'll start with a basic void Main variable.

void main()

4. Now let's use { and } to indicate that all of the following is inside void main.

{

5. Let's print the phrase. cout is the command for output. To print "Hello, world!," we have to do this:

std::cout<<"Hello, world!';

MAKE SURE THAT SEMICOLON IS AT THE END!!! In compiled languages, something has to tell the compiler to go to the next line. In the C languages (C/C++/C#) it's a semicolon. Also, the std:: is the namespace for cout, cin, etc. There is a shortcut we'll use later.
6. Now to end the program. We'll use a } to complete void main.

}

Our final code should look like this:

//If you aren't using Visual C++, skip the following line

#include "stdafx.h"

#include <iostream>

void main()

{

std::cout<<"Hello, world!";

}

That will compile and run, but it immediately closes. We need another command. cin.get(); will work nice. I'll explain what it does in a later tutorial.

#include "stdafx.h"

#include <iostream>

void main()

{

std::cout<<"Hello, world!";

std::cin.get();

}

There you go! it will print "Hello, world!" and wait for a keypress!

By the way on my version you have to do int main instead of void main.
But it helped me!

Any good tutorials out there to learn to code. I should be taking a intro to Java next semester but I want to cut my teeth now.

Int and void are two different... things. I forgot their term. I would expect you could use void as well. Void is another "print something on the screen" thing in the program, I believe.
Now to make this post another use.
This is a review of what @IAmAPersson posted earlier of COUT. If you need another example it is here.

COUT is the way to print output on the screen in a C++ program. Here's my example for COUT:

#include <iostream>
using namespace std;
int main()
{
cout << "Boy I love bacon"
return 0;
}
There is another command like COUT, which is CIN, which accepts input. If someone could go over that I forgot how.
I also am interested in developing small games in C++. If anyone has tutorials on that it would be SUPER helpful.

The Tutorial 0Games

Part 1: A Concept Changed
(get it?)
Alright, why not make more tutorials and give them a name? Like the Coinz Tutorials in the PTC forums.
So here's an if else statement here.
You might be thinking "WOAH, slow down 0Games!" don't worry, I can go over variables first.
So variables. Seen in every programming language in the history of programming, variables are one simple thing: placeholders. They are VERY important.
You can do many things with variables, but I won't show them all. Now, variables.
To make a variable, you simply put the type in front, like this:

int

I'll use an integer for the type as of now. Next, you input what you want it to hold; numbers, text, many things. I'm going to put the text "bacon" in mine. You don't have to use bacon- use whatever you want for your variable.

int variable();

I almost forgot, use whatever variable name you want. Now, do this-

variable="bacon";

There is another way to declare variables. You can declare it all in one line like this:

int variable = "bacon";

It is important to put the semicolon after.
I prefer the two line way, honestly. But if you prefer to put it all in one line that is also a great way to declare variables.
Now you can print your variable like this-

cout variable;

Easy, right? It's a really useful thing to know. Next time I'll show you if statements. See you later and enjoy your knowledge!

@0Games you cannot do that. You did this:

int variable="basic";

Int is for integers, string (under the string library) is for strings. There is also bool, float, and double. A string can be done like this:

#include <iostream>

#include <string>

void main(){

string myString="A string can go here!";

cout<< myString;

}

An "int" holds an integer, like 5, 25, 82, 5482, etc. A "float" is a floating decimal integer, like 5.537, 42.278, 4289.2890, etc. A "double" is a double precision floating decimal. That should be self explanatory. A "bool" (full name "boolean") is a true/false statement. you can do this by doing:

bool myBoolean=true;

Tada!

EDIT: How accurate is a float vs. a double? If I assigned Pi to an int, here's what I would get:

3

If I assigned it to a float, here's what I would get:

3.1415927

If I assigned it to a double, I would get:

3.141592653589793

Now, if you really need to get precise, you can store it as a string, and convert when needed later. Here's Pi as stored in a string:

3.14159265358979323846264338327950288419716939937510

EDIT EDIT: That may not be accurate, as the info was gotten from a Java program

Hey is there anything like a WAIT command from PTCom?

Any of the videos in this series is great for some good C++ teaching.

@GraphicGenius if you have a Windows computer, there should be a library called Windows.h. Include it by doing this:

#include <Windows.h>

Then the command is Sleep. Try as hard as you can to avoid it though. The syntax:

Sleep(milliseconds);

1000 milliseconds is 1 second, so

Sleep(1000);

Is the PTC equivalent of

WAIT 60

Interesting. I got all that from the Bucky Roberts tutorials, but he used CodeBlocks rather than Visual C++.
I have a new problem. I try to run a C++ program and I'm running Visual C++, but when I run it, in the console below it says it has an error when, to my skill level, I see no discrepancies in the code. See if anyone else can find this issue (I'm honestly looking at you, Persson)
#include <stdafx.h>
#include <iostream>
void main()
{
cout<<"I love bacon";
return 0;
}
EDIT: And Persson, you don't need to declare the type of variable again if you do it in two lines. For example:
int variable();
variable="Hello";
That would work I believe, unless it doesn't. I haven't used this language in a long time after I watched a few tutorials from Bucky Roberts (Which I got from a Windows 8 app, not that video mentioned)

@0Games CodeBlocks must be the Visual Basic of C++, cause that barely resembles C++. If I were to do what you mentioned in normal C++, I would get an illegal type error. In normal C++, you also don't need to use a () after a variable, like:

int myVariable;

//as opposed to

//int myVariable();

Anyway, please try to post tutorials on normal or Visual C++. What you are posting is kinda like posting Java tutorials on a C# thread.

EDIT: about your problem. I see two errors. First off, stdafx.h needs to be in "" rather than <>

#include "stdafx.h"

Second, a return value is not needed if you are doing void main(). It is, however, if you are doing int main(void).

#include "stdafx.h"

#include <iostream>

#include <conio.h>

using namespace std;

void main(){

cout<<"banana";

_getch();

}

or

#include "stdafx.h"

#include <iostream>

#include <conio.h>

using namespace std;

int main(void){

cout<<"Miley Cyrus scares me";

_getch();

return 0;

}

Hope this helps!

Also, if you speak German, here's a wonderful community for learning C/C++/C#/Java! Go here! You might find me on there occasionally.

@IAmAPersson I am using an app and the only include thing that it can do is iostream.

@GraphicGenius then you should get a legit compiler

Sorry I can only get one for my ipad.

@GraphicGenius You can only get serious about C++ when you get a true compiler. iostream is only used for console applications, which accounts for about 1% of C++ programming. Plus, even when using console applications, I use a good bit of libraries, such as stdlib.h, time.h, Windows.h, string.h, string, etc.

I learned white space makes your program faster.
Example:

ANumberIChose = 52

Somethin = 68

NumberThatIChoseAgain = 83

That makes it longer.

ANumberIChose               = 52

Something                   = 68

NumberThatIChoseAgain       = 83

That makes it faster.