×
Namespaces

Variants
Actions
(Difference between revisions)

Generating random-value integers in Qt

From Nokia Developer Wiki
Jump to: navigation, search
jimgilmour1 (Talk | contribs)
m
hamishwillee (Talk | contribs)
m (Text replace - "<code cpp>" to "<code cpp-qt>")
 
(14 intermediate revisions by 6 users not shown)
Line 1: Line 1:
{{KBCS}}
+
[[Category:Qt]][[Category:UI]]
{{CodeSnippet
+
{{ArticleMetaData <!-- v1.2 -->
|id=CS001350
+
|sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
|platform=S60 3rd Edition, FP1, FP2<br>S60 5th Edition
+
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
|devices=Nokia 5800 XpressMusic
+
|devices= Nokia 5800 XpressMusic
|category=Qt for S60
+
|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
|subcategory=Base/System
+
|platform= S60 3rd Edition, FP1, FP2<br>S60 5th Edition
|creationdate=April 29, 2009
+
|devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
|keywords=qrand
+
|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
 +
|signing= <!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
 +
|capabilities= <!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
 +
|keywords= qrand
 +
|language= <!-- Language category code for non-English topics - e.g. Lang-Chinese -->
 +
|translated-by= <!-- [[User:XXXX]] -->
 +
|translated-from-title= <!-- Title only -->
 +
|translated-from-id= <!-- Id of translated revision -->
 +
|review-by= <!-- After re-review: [[User:username]] -->
 +
|review-timestamp= <!-- After re-review: YYYYMMDD -->
 +
|update-by= <!-- After significant update: [[User:username]]-->
 +
|update-timestamp= <!-- After significant update: YYYYMMDD -->
 +
|creationdate= 20090408
 +
|author= [[User:Tepaa]]
 +
<!-- The following are not in current metadata -->
 +
|subcategory= Base/System
 +
|id= CS001350
 
}}
 
}}
  
 
==Overview==
 
==Overview==
  
This code snippet shows how to generate a random integer in Qt for S60.
+
This code snippet shows how to generate a random integer in Qt.
 
+
'''Note''': In order to use this code, you need to have Qt for S60 installed on your platform.
+
 
+
  
 
==Preconditions==
 
==Preconditions==
  
* Install latest Qt for S60 see [http://wiki.forum.nokia.com/index.php/Qt_for_S60_-_Installation_packages Qt for S60 - Installation packages]
+
* Install [[Qt SDK]]
* Check this link for installation guide: [http://pepper.troll.no/s60prereleases/doc/install-s60.html How to install the package].
+
* Go through this article: [[Getting started with Qt for S60]]
+
 
+
  
 
==Source==
 
==Source==
  
<code cpp>
+
<code cpp-qt>
 
#include <QGlobal.h>
 
#include <QGlobal.h>
 +
#include <QTime>
  
 
int QMyClass::randInt(int low, int high)
 
int QMyClass::randInt(int low, int high)
Line 36: Line 47:
 
</code>
 
</code>
  
<code cpp>
+
<code cpp-qt>
// Random value between 0-100
+
 
 +
// Create seed for the random
 +
// That is needed only once on application startup
 +
QTime time = QTime::currentTime();
 +
qsrand((uint)time.msec());
 +
 
 +
// Get random value between 0-100
 
int randomValue = randInt(0,100);
 
int randomValue = randInt(0,100);
 
</code>
 
</code>
Line 46: Line 63:
  
  
[[Category:Qt]][[Category:Qt for S60]][[Category:Code Examples]][[Category:UI]]
+
[[Category:Code Snippet]][[Category:MeeGo Harmattan]] [[Category:Symbian]]

Latest revision as of 04:16, 11 October 2012

Article Metadata
Tested with
Devices(s): Nokia 5800 XpressMusic
Compatibility
Platform(s): S60 3rd Edition, FP1, FP2
S60 5th Edition
Symbian
Article
Keywords: qrand
Created: tepaa (08 Apr 2009)
Last edited: hamishwillee (11 Oct 2012)

Contents

[edit] Overview

This code snippet shows how to generate a random integer in Qt.

[edit] Preconditions

[edit] Source

#include <QGlobal.h>
#include <QTime>
 
int QMyClass::randInt(int low, int high)
{
// Random number between low and high
return qrand() % ((high + 1) - low) + low;
}
// Create seed for the random
// That is needed only once on application startup
QTime time = QTime::currentTime();
qsrand((uint)time.msec());
 
// Get random value between 0-100
int randomValue = randInt(0,100);


[edit] Postconditions

A random number is given.

This page was last modified on 11 October 2012, at 04:16.
1299 page views in the last 30 days.
×