Random numbers

[gd566]

I am wrote a fuction to randomly generate stats for a computer opponent. My problem is that srand(time(0)) does not generate new numbers fast enough. I need 5-8 random numbers, 1 for each stat.

Here is a small piece of the for loop I am using to generate a value for each stat.

        for (c=1; c<5;c++)            // for each stat 
        {
            srand(time(0));
            randomNumber = rand();   // random number
            m = ((randomNumber %10)+3); 

            if (c==1) 
            {
                cstr = (m*lvl);      // opponent's stat
            }

What do you suggest I do?

[locorecto]

What do you mean with fast enough???

[gd566]

Exactly what I said, srand(time(0)) generates a different number every second, I think. This funtion calls srand for each of the 5 stats I am using in my game. C++ is able to run thru the code almost instantly.

My book only offers srand(time(0)) for generating new numbers. Is there something else I can use, or a different way of writing the code so that each instance of the loop generates a new number?

[CheesyBeefy]

Only use srand(time(0)) once. That seeds the rand() function which will give you a random number each time.


[code=cpp] srand(time(0));
for (c=1; c<5;c++) // for each stat
{
m = (rand() % 10) + 3; // random number

if (c==1)
{
cstr = (m*lvl); // opponent's stat
}[/code]

[gd566]

=[ that didnt work either Cheesy. All 5 stats still have the same value.

--edit--

Looks like I got it. Thank you for your help locorecto and CheesyBeefy

        for (c=1; c<5;c++)
        {
            srand(time(0)*m);
            randomNumber = rand();
            m = ((randomNumber %10)+3); 

[sokkha]

hi ,
I'm a french beginner on C++.
i try to generate hasard with a programm to choose randown number.I have already write this code:


#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
long n = 0;
srand(time(NULL));
n = rand();
do
{
printf("%ld",n);
} while (getchar()!='Q');

return 0;
}




What does i do if i want choose a randown number n betwween 0 and 54.
I dont want use loops or if fonctions.
ty for your help.

[HeatMan]

I think you should use "rand() % 54 + 1", in the place of the rand().

[sokkha]

ty for you help HeatMan

[jsmith]

gd566 that won't work.

You need to call srand() exactly ONCE in your program. Subsequent to that, calls to rand() will -- must -- return unique numbers until the RNGs cycle expires (2^32).