dev-cpp-users

[Dev-C++] How do you get random numbers in devc++?

[chromatonus 7. <chr...@ho...>]

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RE: [Dev-C++] How do you get random numbers in devc++?

[Ioannis V. <no...@ho...>]

In C:


#include <stdlib.h>
#include <time.h>


...
int r;
srand(time(NULL));

...

/* One random number from 0 to RAND_MAX (which can't be larger than
32767 */
r=rand();

...

/* Another random number */
r=rand();



Using RAND_MAX you can get any range you want in a portable way!



Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
* Alternative URL: http://run.to/noicys

Re: [Dev-C++] How do you get random numbers in devc++?

[David M. <ci...@ya...>]

First you need to include stdlib.h

next you need to call the function srand() to initialize the random number 
generator
If the number you use is the same the same sequence of random numbers is
generated, because of this it is normal to use the time function to 
initialize the
generator as the time is constantly changing e.g. srand(time(NULL));
N.B. You need to include time.h to get the time function.

next you want to call the rand function to get your random number
N.B. the rand function returns a random number between 0 and RAND_MAX
usually you wish a number within a certain range the following formula 
should help you.

lower_bound + rand() % (upper_bound - lower_bound + 1)
eg.  To get a random number between 1 and 10 (inclusive) the following 
should sufice

1 + rand() % (10 - 1 + 1);