How would you go back to a section of code?

I'm just a newb so this is very hard for me.
I'm trying to make a guess what number this is game and I want to go back to a section of code like I would in Qbasic. The problem is that C++ doesn't use labels like 10, 20, 30 ,40, etc..
Any help would be appreciated.

The code so far is:

Code:

---

#include <iostream>
int x=0
int main()
{
cout<< "You get three trys.\n"
cin>>x
x=x+1}
if (x=1)
{
cout<< "First try"
}
if (x=2)
{
cout<< "Second try"
}
if (x=3)
{
cout<< "Last try"
}

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do it through while() { loops

and if you want the while loop to stop, just use the function break;

Also, you're forgetting all the semi-colons at the end of certain functions/declarations.

Code:

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if (x=1)

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You probably mean if (x==1).

Quote:

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Originally Posted by s3abass

do it through while() { loops

and if you want the while loop to stop, just use the function break;

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Could you give me an example?
I'm just a newb :D

Code:

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while ( condition )
{
    ...
}

---

As long as condition evaluates to being true, the code will repeat. Sometimes you need to increment values to cont through an array for example, but in that case you would probably use a for loop. There are also do while loops that are very similar.

At one point you say:
x=x+1}

I'm not certain what the "}" is for in this statement, but you may want to replace it with a semicolon. I think your compiler thinks that that may refer to the end of int main().

Quote:

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Originally Posted by sean_mackrory

Code:

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while ( condition )
{
    ...
}

---

As long as condition evaluates to being true, the code will repeat. Sometimes you need to increment values to cont through an array for example, but in that case you would probably use a for loop. There are also do while loops that are very similar.

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Then I have to make 3 while commands?

Code:

---

#include <iostream>
using namespace std;

// Function that will be called every loop
void Function ()
{
       
        cout << "Some program stuff";
        cout << endl;
       
}

int main ()
{
       
        // Variable for our choice
        char choice;
       
        // Infinite loop. This will not end until we break out of it.
        // Because 1 is always 1.. it will never end
        while ( 1 ) {
               
                // Call the function
                Function ();
               
                cout << "Type Q to exit";
                cin  >> choice;
               
                // If user typed 'q' then break;
                if ( choice == 'q' ) break;
               
        }
       
        return 0;
       
}

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Well I've been looking at your code and it actually does nothing close to what you want it to do. You can do labels in C++, and sometimes it is necessary, but it is generally a bad idea so I won't even show you how to do it until you learn the alternatives.

Quote:

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like I would in Qbasic

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I warned someone about this the other day - FORGET QBASIC. Not that you've done anything wrong, but get out of that mindset right now. It's going to lead to really sloppy programming style. QBasic is good for teaching the basic concepts, but when you learn a new language, you've got to keep your mind really open.

I'll tell you what I'll do - write out a QBasic version of what you want done, test that it works the way you want it, email it to me, and I'll send you the C++ version, with an explanation of the concepts. I don't do this for everyone, but I'm in a good mood, and you don't have the attitude problems that a lot of newbies browse this board with.

My Qbasic skills are horrible too so I can't send anything. :( The description would be a program that would give you three chances to guess a certain number, and after three guess's it would say "too bad" and end.

Yes, i us like 100's of while(1) loops in my "games"

This is by no means working code...but I added the main parts, and left the rest to you. Af far as I can tell, this should accomplish what you're looking for (with minimal runtime errors) :)

Code:

---

int main()
{
        bool Win = false; //Keeps track of win

        for(int x = 0; x < MaxNumberOfGuesses; x++;)
        {
                //Print the instructions here and get the user to input a guess (Note: x+1 is the guess# they're on)
                //If the Guess == Correct Answer, set Win = true and break out of the loop
                        //Otherwise, let the for loop do it's job and increment x by one.
        }
        //If you get out here and Win = true, you know the user must have guessed right
                //Display a message accordingly
        //If Win = false, then they did not guess it in time, and let them know they lost...huge

        //Throw in a pause function (fflush()/getch() or getchar() are recommended to any system() calls)
                //So that it doesn't quit before they know their result

        //Exit
        return 0;
}

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I learned BASIC first too...

Like Sean said, BASIC is great for learning the concepts that apply to all programming languages... things like:

1 - A program is a sequnce of instructions.
2 - Different types of variables (integers, floating, strings).
3 - An assignment statement is NOT an equation (x = x+1).
4 - A program can have loops.
5 - A program can have conditional branching (if-statements and switch-case statements ).


goto / labels are rarely used in C++. These are generally considered bad practice in structured programming and object oriented programming.

Functions:
Everything in C++ is done with functions. You may have used functions in BASIC. But if not, functions are alot like subroutines. The program-flow goes-off and executes the function, and then returns to where it came from, optionally bringing-back a return value with it.

Now, there are a couple of issues that make C++ functions more difficult than BASIC subroutines: A function can only return one value, and global variables are also considered bad practice. This means that you have to use some "tricks", like pointers and references.

Finally, C++ is a much more complex language than BASIC. "Hello World" is ONE LINE in BASIC :) I have a BASIC book with the entire language reference in the back half of the book. I have not found a book with ALL of the C/C++ library functions! :( And of course, C++ adds Object Oriented Programming. :)

Quote:

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"Hello World" is ONE LINE in BASIC

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What've you been smoking? If I remember correctly...

Code:

---

REM Hello World.bas
REM Hello World
REM
REM Prints "Hello World" to the screen
REM (C) 2004 Sean Mackrory

CLS
LOCATE 1,1:
COLOR 7,0
STRING$ = "HELLO WORLD"
PRINT STRING$
END

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I was going to draw Hello World with the geometry functions, but that would just be overkill, now wouldn't it?

Or alternately...

Code:

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PRINT "HELLO WORLD"

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Sean? Does the word "overkill" come to mind?

Quote:

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Originally Posted by Sean

I was going to draw Hello World with the geometry functions, but that would just be overkill, now wouldn't it?

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I guess it does :)

Hey,

I'm still very new to C/C++ but I took a shot at it.. if any experts notice its extremely inefficient, which it probably is ;) then just tell the maker to disregard the code. So.. this is what I came up with,

Code:

---

#include <iostream>

using namespace std;

int main()
{

int NUMBER = 89; //the number to be guessed.
int i;
int a[4]; //number of tries +1

cout<<"You've got three trys.\n";

for(i = 1; i <= 4; i++)
{
    if ( i < 4) {
        cin>>a[i];
        }
       
        if(a[i]==NUMBER) {
                cout<<"Wow, you've gotten it right!\n";
                break;
        } else {

                if(i == 1) {
                        cout<<"First try\n";
                } else if (i == 2) {
                        cout<<"Second try\n";
                } else if (i == 3) {
                        cout<<"Third try\n";
                } else {
                        cout<<"Game over\n\n";
                }

        }

}

cout<<"Thats all";
cin.get();

}

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Thats sorta what some were talking about with the while statement, but I used for, and some ifs.. its probably way longer than it needs to be.. I just started typing it so Id have to think about the possible concepts, if it were my script.

Hi Dae,

I worked through this one last night. Like you, I used a for loop and a whole mess of ifs (though my for loop is a little different than yours).

I won't post my code unless XenoForce says it's ok though. I really like figuring out an assignment (even if it is only from a book or off the net) on my own and if he's the same he may not want to see too much.

Thanks for posting this XenoForce. There's a lot of great stuff going on in this forum but a lot of it is over my head still. It's nice to be able to read stuff that beginners can get in on a little.

As has been mentioned, use a loop instead of goto. It's better ;)

Code:

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bool correct = false;  //Did they get it right?
int tries = 0;                //How many times have they tried?
int guess;                  //What did they guess?
 
while(tries < 3 && !correct)  //Will loop until tries is 3 or correct is true
{
  cout << "Enter number: ";
  cin >> guess;
  if(guess == 12345)  //or whatever number you want
  {
          cout << "You got it right!" << endl;
          correct = true;  //end the loop
  }
  else
  {
          cout << "Wrong, try again." << endl;
          tries = tries + 1;  //increase the counter
  }
}

---

Quote:

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Originally Posted by Hunter2

As has been mentioned, use a loop instead of goto. It's better ;)

Code:

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bool correct = false;  //Did they get it right?
int tries = 0;                //How many times have they tried?
int guess;                  //What did they guess?
 
while(tries < 3 && !correct)  //Will loop until tries is 3 or correct is true
{
  cout << "Enter number: ";
  cin >> guess;
  if(guess == 12345)  //or whatever number you want
  {
          cout << "You got it right!" << endl;
          correct = true;  //end the loop
  }
  else
  {
          cout << "Wrong, try again." << endl;
          tries = tries + 1;  //increase the counter
  }
}

---

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Pretty nice, .. now if you replaced the "Wrong, try Again" line with some if statement, you could have it say the whole "First try, Second try, Third try", thing.

Hi Elhaz,

Yeah I figured as much.. I try not to give full source code, but considering mine was competely inefficient I figured it needed enough touchups as it is but got the idea through on how to do it (ie, an example). If people want to do it themselves, they can look away, or just get the concept and try their own ways without copying it.. so if you truelly want to do it yourself, you can, eh ;)

Hunter2,

That while is loads better than my for loop. I never woulda thought of using the bool. Cool.

Dae,

Quote:

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If people want to do it themselves, they can look away...

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Ya, I suppose you're right. But it's sooo hard to look away! :D

Thanks a bunch!!! By the way, how do you make pauses at the end so the user can see the end product?

Either use
system("PAUSE");
or
cin.get();

to use the first include stdlib.h
to use second im not exactly sure if you have to include anything because my teacher prefers the first.

>> to use second im not exactly sure if you have to include anything because my teacher prefers the first.

Hm, why does your teacher prefer this?

I would stronly recomend the second method. It is in the iostream header under the STD namespace

Code:

---

#include <iostream>
using namespace std;

int main ()
{

    cout << "Hit enter to quit!";

    cin.get ();
    return 0;

}

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