Need help on small C++ program...

eddieringle · PostPosted:Mon Jun 12, 2006 4:59 pm

Hey all... haven't posted in awhile, but I have still been checking up on the site. : )

I have a little C++ project I was writing just for a little learning experience with C++. When I compile the code, it says that there is a syntax error with return.

Here is the code... (don't bother making remarks about the point of the program, I just need a solution to this problem)

Code:

// INFINITY

//Include the library file

#include <stdio.h>
#include <iostream>
using namespace std;

//Start the program

int main(int arg, char* pszArgs[])
{
	cout << "This program was written by Eddie Ringle, and is suppose to simulate infinity.\n"
		 << "The only way to destroy this infinite loop is to shut down the program.\n"
		 << "So when you get tired, you know what to do... : )\n";

	int infvalue;
	do
	{
		//start the infinite loop process
		infvalue = 0;
		cout << "\n Start at 0\n";

		//loop forever
		int addvalue;
		for(;;)
		{
			addvalue = 1;

			//Add addvalue to infvalue
			infvalue = infvalue + addvalue;
		}

		//Output

		cout << "\n The new total is: "
			<< infvalue
			<< "\n";
	}
	return 0;
}

Thanks!

Soldier of Light · PostPosted:Mon Jun 12, 2006 5:29 pm

Probably the for(;;) line, but I don't use C++ so I wouldn't know.

If I were you I'd use while(1).

ChaosR · PostPosted:Tue Jun 13, 2006 7:07 am

I've written something like this yesterday

Code:

//forever, c++

#include <stdio.h>
#include <iostream.h>

int main()
{
    unsigned int x;
    for ( x = 0;; x++ ) {
        cout << x << "\n";
    }
}

just leave the test away, then it will continue as long as possible.

actually, i made it for my new TI calculator in TI-basic and wondered how to do it in C++, so i tried, and that's the result.

EDIT: Improved my C++ to an unsigned int, to run even longer

EDIT2:
infinity on TI-basic, this time, better:
TI version:

Code:

name:forever
:0->X
:While 1
:X + 1 -> X
:Disp X
:End

Soldier of Light · PostPosted:Tue Jun 13, 2006 7:23 am

while(1)
While will continue as long as the condition is true. Since 1=true, it will never stop.

ChaosR · PostPosted:Tue Jun 13, 2006 7:29 am

a while is not really needed, in my TI, cuz it'll take days for my calculator to complete it, TI-basic is kinda slooooooooooooooooooooooooooooooooooow

Soldier of Light · PostPosted:Tue Jun 13, 2006 7:37 am

I'm well aware of that. Just pointing out that there is an infinity.

ChaosR · PostPosted:Tue Jun 13, 2006 7:39 am

btw, can you give me an example of an infinite increasing number program in TI-basic using a while(1)

eddieringle · PostPosted:Tue Jun 13, 2006 5:20 pm

That's not what I need... thanks for trying... but my problem is that the compiler thinks that return is a syntax error, when it is being used correctly.

BK · **Joined:**Tue Jun 13, 2006 6:07 pm **Posts:**1

I think you are missing the While part of your do loop.

e.g.

Code:

do{

 ...

}while(1);

return 0;
}

Good tip for all beginners:
Often a compiler error is a problem on the line above where it thinks the problem is.

krageon · **Joined:**Mon Oct 31, 2005 2:40 pm **Posts:**62

Small Addition:

Code:

      //loop forever
      int addvalue = 1;
      for(infvalue;;)
      {
         //Add addvalue to infvalue
         infvalue = infvalue + addvalue;
         cout << infvalue << endl;
      }

Burningmace · PostPosted:Fri Jul 07, 2006 9:28 am

The smallest and most simple code to do it is just:

Code:

void main() {
    // Insert the stuff before the loop here.
    do {
        infvalue = infvalue + addvalue;
        cout << infvalue << endl;
    } while(1);
}

prophile · PostPosted:Tue Jul 11, 2006 3:04 pm

Code:

#include <iostream>
using namespace std;

int main ( int argc, char** argv )
{
    static int num = 0;
    cout << num << endl;
    num++;
    main ( argc, argv );
}

Recursion for the win!

Tycho · PostPosted:Tue Jul 11, 2006 5:44 pm

Quote:

Code:

#include <iostream>
using namespace std;

int main ( int argc, char** argv )
{
    static int num = 0;
    cout << num << endl;
    num++;
    main ( argc, argv );
}

Recursion for the win!

BAD idea. Do you realize that one of the main reasons Chris Delay's BTree is so slow is due to using recursion? The reason is that it keeps filling the call stack with more and more function calls. Eventually, you get a call stack overflow. NEVER use recursion. EVER.

VITAS · **Joined:**Wed Feb 01, 2006 4:28 pm **Posts:**97

maybe thats the reason darwinia is so slow too (a t least last time i tried it)

Tycho · PostPosted:Tue Jul 11, 2006 6:27 pm

Quote:

maybe thats the reason darwinia is so slow too (a t least last time i tried it)

It's likely.

Need help on small C++ program...

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