Thread: Tell me about C/C++

int main()
{
int a, b;
int result;

a = 5;
b = 4;
a = a + 1;
result = a - b;

cout <<result<<endl;
}

It might look really confusing at first, but when you actually sit down and read it slowly, it's pretty easy to understand.

In the code I provided, I'm saying that a = 5 and b = 2, then I'm taking a and adding 1 to it, then taking the new answer of a and subtracting it from b which would give me 2.

I just started learning yesterday :3

I'm using code::blocks for my C++ writing along with the www.cplusplus.com website.

Should I learn C or C++ first?

I'm learning C++ to learn how to make my own game engine. I don't really know anything about C.

Well, it depends on what you want to do with it. C++ is better for large projects, while C is best if you're writing time-critical applications. C would also be the logical choice if you want to make other things than computer programs, like if you want to program other integrated chips.
Many hold that you should always learn C first and then move on to C++, as C++ almost is a superset of C, but either way knowing one will help you with the other.

Originally Posted by khh

Many hold that you should always learn C first and then move on to C++

I disagree with that

There's certain things that are the "right way" in C, but the "wrong way" in C++ (and vice versa)
Arrays being the biggy

You may fall into the trap of using wrong methodologies in either language

Originally Posted by Ynot

There's certain things that are the "right way" in C, but the "wrong way" in C++ (and vice versa)
Arrays being the biggy

Arrays are exactly the same in C and C++.

He's right about the right and wrong ways being different in C and C++

Critical section in C

Code:

void CriticalMethod(void){
   pthread_mutex_lock(somelock);
   //some critical stuff
   if (boolean){
      pthread_mutex_unlock(somelock);  //have to unlock in every exit path
      return;
   }
   //more critical stuff
   pthread_mutex_unlock(somelock);
}

Critical section in C++

Code:

//Autolock.h
struct AutoLock{
   public:
      AutoLock(pthread_mutex_t * lock){
         pthread_mutex_lock(lock);
         mylock = lock;
      }
      ~AutoLock(void){
         pthread_mutex_unlock(mylock);
      }
   private:
      pthread_mutex_t mylock;
}

Code:

void CriticalMethod(void){
   AutoLock lock(somelock);  //will automatically unlock when it returns
   //some critical stuff
   if (boolean){
      return;
   }
   //More critical stuff
}

***********************


What exactly would you like to know guitarboy, honoured you came to me

I learned C first, then taught myself C++. I would recommend just learning C++, most programming is done in C++, and it's a lot easier. It's also a good thing to understand object oriented programming.

Here's some things to understand, in order
Primitive types: int, long, float, char
Scope
methods and functions
pass-by-reference vs pass-by-value
const
Pointers
Objects (classes and structs)
Constructors and destructors

Feel free to IM me about anything

Originally Posted by ninja9578

Arrays are exactly the same in C and C++.

I know they are the same
but they're hailed in C, and frowned upon in C++

From the man himself
http://www2.research.att.com/~bs/bs_faq2.html#arrays

Originally Posted by slayer

I'm learning C++ to learn how to make my own game engine. I don't really know anything about C.

If you're just getting started with C++, I recommend a few smaller (like, MUCH smaller) projects first.

Originally Posted by Replicon

If you're just getting started with C++, I recommend a few smaller (like, MUCH smaller) projects first.

Indeed,
first learn the language, then do something small and easy to get the hang of things

Originally Posted by Ynot

hangman is always a good first game

pick a random word from file of possible words
let the user guess letters
print letters found, and underscores for not found
keep a count of num guesses

You've just started on your journey as a bridge-builder
Your ultimate aim is this
http://secretperson.files.wordpress....n-bridge-l.jpg
but you've got to start off building a few of these first
http://www.freeimageslive.co.uk/file...46.preview.jpg

I agree, you saw my design right? Mario is a fairly simple game, yet it's quite a lot of classes and functionality. I could probably knock it out in a day, but I'm very experienced.

I guess I made my first game!

Simple if/else statement set up.

Code:

#include <iostream>
using namespace std;

int main()
{
    int a;

    cout << "Please enter the number 3: ";
    cin >> a;
    if ( a == 3)
    {
        cout << "You have entered the right number!";
    }
    else
    {
        cout << "You lost the game.";
    }
    return 0;
}

If you enter the number 3, you win! But if you don't, then you lose!

How would I set it up so it repeats the first line of code?

I want to set it up so that if the player enters the wrong number, then it goes to repeat the "Please enter the number 3" part. Or, if they get it wrong, then it asks for the player "Do you want to play again? Y/N" and if they enter Y then the whole thing repeats itself, or if they enter N, then the game exits.

either, really
they're 80% the same
(C++ started out as an extension to C)

depends if you prefer procedural or object orientated programming