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# No Surprise, I need more batch help

Is there a way to have %random% kept to a certian limit? like 1-10? if so the code would be nice, if no code, then jsut tell me how and i will do it. Thanks

90Views10Replies

Is there a way to have %random% kept to a certian limit? like 1-10? if so the code would be nice, if no code, then jsut tell me how and i will do it. Thanks

## Comments

12 years ago

You will need to look up what range the random number generator will generate. Normalize that number with an expression or expressions that will scale it from 0 to 10. If you need whole numbers, there might be a rounding function.

Reply 12 years ago

The %random% variable generates a random integer from 0 to 32767. As for using the standard way of math in CMD, Batch, etc. it automatically rounds it down to the nearest integer.

Reply 12 years ago

And there is the whole business where it is not truly random so you have to seed it with something pseudo-random, like the time... :)

Reply 8 years ago

Well actually, no number can be randomly generated, but all of them are extremely hard to find out the pattern.

Why do you think nobody has found out the secret to KENO (I don't know if you know, but KENO is a gambling thing where I live).

It's not as easy as you think.

8 years ago

Actually, I'm changing my answer.

set /a number=%random% %% max + minWhere "max" is the maximum number you want, and "min" is the minimum number.

Example:

set /a dice=%random% %% 6 + 1The variable "dice" would be set to a random number from 1 to 6 exclusive.

8 years ago

Thats easy, create a randomnum variable and set it as random and use the IF and GTR commands

:random

set /p randomnum=%random%

If %randomnum% GTR 10 goto random

12 years ago

Set /a random=%random% / 2978

Note: There's like a .0002% chance it will come up with 11. To prevent this, change it to 2979. It will just make the 10 appear .0002% less often.

12 years ago

or

Reply 12 years ago

the second option may freeze for quite a while . .

the most common way is mod division to the values you need

for example you need ramdom between 1 and 10 including

X = %random% mod 10 + 1

you may need help of an external app to do the calculation

Reply 12 years ago

lol thanks again, always there when i need batch help :D