Archived:Random value generation in Open C

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Article Metadata

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Tested with

Devices(s): Nokia N93

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Compatibility

Platform(s): S60 3rd Edition

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Platform Security

Signing Required: Self-Signed

Capabilities: None

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Article

Keywords: srand(), rand()

Created: nymanaki (03 Apr 2008)

Last edited: hamishwillee (06 Aug 2012)

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.