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Archived:Random value generation in Open C

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Archived.pngArchived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.

Article Metadata
Tested with
Devices(s): Nokia N93
CompatibilityPlatform Security
Signing Required: Self-Signed
Capabilities: None
Article
Keywords: srand(), rand()
Created: nymanaki (03 Apr 2008)
Last edited: hamishwillee (06 Aug 2012)

Contents

Overview

Random value generation in Open C applications can be done with functions called srand() and rand(). Function srand() sets its argument seed as the seed for a new sequence of pseudo-random numbers. Sequences are repeatable by calling srand() with the same seed value. Function srand() needs to be called only once in a program and this should be done before the first call to rand().

Note: In order to use this code, you need to install the Open C plug-in.

MMP file

The following libraries are required:

LIBRARY libc.lib

Source file

#include <stdio.h>   //printf
#include <stdlib.h> //srand, rand
#include <time.h> //time
 
int LOWER_BOUND = 1;
int UPPER_BOUND = 6;
 
int main (void)
{
int index = 0;
int random_number = 0;
char random_letter = ' ';
time_t now;
 
/* get current time from the system clock */
time(&now);
 
/* set seed for a new sequence of pseudo-random numbers */
srand((unsigned int) now);
 
/* loop 10 rounds to generate different numbers/letters */
for(index = 1; index <= 10; index++)
{
printf("round:%d\n", index);
 
/* get random number between 1 and 6 */
random_number = rand() % (UPPER_BOUND - LOWER_BOUND + 1) + LOWER_BOUND;
printf("random number:[%d]\n", random_number);
 
/* get random character (lowercase letters in the ASCII) */
random_letter = 'a' + rand() % 26;
printf("random letter:[%c]\n", random_letter);
 
printf("- - -\n");
}
 
return 0;
}

Postconditions

10 random numbers (1-6) and 10 lowercase ASCII characters are displayed to standard output.


This page was last modified on 6 August 2012, at 08:00.
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