generate rand() in text box

Hi ,

Trying to generate 6 digit random number and display in text box as RN: XXXXXX where X is the random number, have had some help but still unable to do the following:

1. Adding the "RN:" parameter to SetDlgItemInt function.
2. Converting iRandomNo to a displayable format.

Please advise , or point to example snippits.

thnx (hope the format is OK)

Code:

---


HWND hcombo = GetDlgItem(  hwnd, IDC_TEXTBOX_EDIT); 
                         
        int iRandomNo=0;

        for(int i=0;i<6;i++)

  { 
      iRandomNo = iRandomNo*10 + rand()/10;
  }

      std::ostringstream stm;


SetDlgItemInt(hwnd, IDC_TEXTBOX_EDIT, "RN:", stm);

---

rand()%10;

Some rand() pages:

http://faq.cprogramming.com/cgi-bin/...&id=1043284385
http://eternallyconfuzzled.com/articles/rand.html

>Trying to generate 6 digit random number and display in text box as RN: XXXXXX where X is the random number

Code:

---

HWND hcombo = GetDlgItem(  hwnd, IDC_TEXTBOX_EDIT); 
                         
  int iRandomNo=0;

  for(int i=0;i<6;i++)

  { 
      iRandomNo = iRandomNo*10 + rand()/10;
  }

  std::ostringstream stm;
  stm << "RN:" << iRandomNo;

  SetDlgItemText(hwnd, IDC_TEXTBOX_EDIT, stm.str().c_str());

---

> rand()/10
See vart's post.

Actually, since RAND_MAX is at least INT_MAX which is at least 2^16-1 (65535), you could generate two three digit numbers, or one five digit and one one digit number.

Code:

---

iRandomNo = ( (rand() % 1000) * 1000) + (rand() % 1000);

---

>See vart's post.
That's not a good way. And my post was addressing the dialog box question. Admittedly I never looked at the random number part. I just copied it verbatim.

It's better than rand()/10!

Ok, I'm sorry for the confusion. Here's a correction to the rand() code I posted above:

Code:

---

      iRandomNo = iRandomNo*10 + (int)(((double) rand() * 10.)/(RAND_MAX + 1.));

---

Right, sorry.

Though I still think that generating 2 numbers would be a good idea.

>> Actually, since RAND_MAX is at least INT_MAX.
Why do you say that? I thought I remember seeing a rand_max of 32767 or so on a machine with a 4 byte int.

>Though I still think that generating 2 numbers would be a good idea.
True, I believe that's the best way of doing it. And I missed the bug in the random number generation formula. I knew something didn't look quite right. But I was focusing on questions 1. and 2. in the original post. ;)