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Generating random-value integers in Qt

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Line 28: Line 28:
 
<code cpp>
 
<code cpp>
 
#include <QGlobal.h>
 
#include <QGlobal.h>
 +
#include <QTime>
  
 
int QMyClass::randInt(int low, int high)
 
int QMyClass::randInt(int low, int high)
Line 37: Line 38:
  
 
<code cpp>
 
<code cpp>
// 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>

Revision as of 09:17, 19 November 2009

Template:KBCS

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: (29 Apr 2009)
Last edited: tepaa (19 Nov 2009)

Contents

Overview

This code snippet shows how to generate a random integer in Qt for S60.

Note: In order to use this code, you need to have Qt for S60 installed on your platform.


Preconditions


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);


Postconditions

A random number is given.

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