Comments on: 5.9 — Random number generation

By: THE TERMINATOR

THE TERMINATOR — Sun, 08 Aug 2010 20:53:31 +0000

HELP!!! MY PRNG KEEPS PRINTING “4 8 15 16 23 42″ NO MATTER WHAT I DO!!!!!

By: Jack Sparrow II

Jack Sparrow II — Thu, 05 Aug 2010 15:16:25 +0000

My question is how do I generate random numbers without generating the same ones multiple times?

By: Jjtricky

Jjtricky — Sun, 18 Jul 2010 01:04:01 +0000

I really don’t get this line:

 if ((nCount+1) % 5 == 0)

Surely, this would break the line after the fourth number, as:

nCount=4
(4+1)/5 

5/5 = 1.0

Therefore, the line is ended

By: Gigith

Gigith — Sat, 12 Jun 2010 18:59:48 +0000

Why is stdafx.h included?
I could understand you breaking GCC/MinGW/Other compatibility if you had to, but it doesn’t look like it even gets used in those examples.

By: Erik

Erik — Fri, 28 May 2010 18:13:05 +0000

Hi Alex!
I want to start learning C++,and I have an idea of a program,what I want to create. I want to randomize some sentences(for example:you push a button of a program,and it shows a sentence:Welcome to my world!then push again,and shows:How are you?) Is it possible to do with this tutorial?

Hope to hear from you soon!

By: Nathan

Nathan — Wed, 19 May 2010 02:24:57 +0000

using namespace std;

int nNum;
bool check;

int main()
{
    srand(time(0)); // set initial seed value to system clock
	int nNum = rand();
    cout << nNum;
	while (check() == false)
	{
		check();
	}
}

bool check()
{
	int nCheck;
	cin << nCheck;
	if (nCheck == nNum)
	{
		cout << "Correct!" << endl; 
		return 1;
	}
	else if (nCheck < nNum)
	{
		cout << "Too Low." << endl; 
		return 0;
	}
	else if (nCheck > nNum)
	{
		cout << "Too High." << endl; 
		return 0;
	}
}

Hey I don't know if anyone could help me but I'm trying to make the game Alex mentioned called Hi-Lo and I get the errors

"main.cpp(15) : error C2064: term does not evaluate to a function taking 0 arguments" 

and 

"main.cpp(15) : fatal error C1903: unable to recover from previous error(s); stopping compilation"

Can anyone tell me what I did wrong?

By: Shuuuuuu

Shuuuuuu — Sat, 08 May 2010 12:59:54 +0000

Alex, you have a v good understanding of the field which you deal with. Thanks for all these detailed tutorials. Keep up the good work.
Thankyou Alex.

By: Mike

Mike — Tue, 16 Mar 2010 21:55:57 +0000

You can use ASCII numbers and use static_cast to make them into characters

By: Mike

Mike — Tue, 16 Mar 2010 20:09:54 +0000

Hi Alex, could you please explain how this works?

// Generate a random number between nLow and nHigh (inclusive)
unsigned int GetRandomNumber(int nLow, int nHigh)
{
    return (rand() % (nHigh - nLow + 1)) + nLow;
}

By: RAMI

RAMI — Thu, 18 Feb 2010 08:56:34 +0000

hi when i run my program it give me a random number but when i rerun it agian it give me the same number i want each time i run the program i want it to give me a diffrent number