Srand() and rand() help
Author
I'm having some problem remembering things to do with the above and I don't have my text book with me to check it up so thought you guys could help.
First of all in C, what library do I include to use srand() and rand().
If I remember rightly I need to also include time.h to use the time in seeding the generator but can't remember what the syntax for srand() is.
Am I correct in saying that if I wanted a number from 0 to 10 after srand() has been used the code would be
number = rand() %10;
and if I want from 10 to 20 it is
number = (rand() %20) +10;
Help Please!!!
[edited by - SteveBe on July 30, 2002 10:02:35 AM]
Off the top of my head:
#include "stdlib.h"
The syntax is (if you are writing a windows app)
srand((unsigned)GetTickCount())
To get a number between 0 and 10 you
number = rand() % 11 ;
a random number between 10 and 20 would be
number = (rand() % 11) + 10;
D.V.
Carpe Diem
#include "stdlib.h"
The syntax is (if you are writing a windows app)
srand((unsigned)GetTickCount())
To get a number between 0 and 10 you
number = rand() % 11 ;
a random number between 10 and 20 would be
number = (rand() % 11) + 10;
D.V.
Carpe Diem
Author
Thanks DeltaVee but I''m such a newbie I''m not using windows applications yet. I''m doing it all in boring old dos!!!!!
So if anyone else can tell me how to seed the generator for a dos program using time.h I''d be very grateful.
And thanks for correcting me on my rand() syntax.
So if anyone else can tell me how to seed the generator for a dos program using time.h I''d be very grateful.
And thanks for correcting me on my rand() syntax.
time_t time( time_t *timer );
time_t is just a long so ...
long t;
time(time_t *)&t);
srand((unsigned)t)
D.V.
Carpe Diem
time_t is just a long so ...
long t;
time(time_t *)&t);
srand((unsigned)t)
D.V.
Carpe Diem
Or even shorter:
There are better ways to distribute random numbers. Search around on the forums. It comes up quite often.
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srand((unsigned)time(NULL)); There are better ways to distribute random numbers. Search around on the forums. It comes up quite often.
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