China DOS Union

I searched the forum for a long time and still didn't figure out the usage of random. What do these mean?

set /a %%av=!random!%%40*2,%%ai=!random!%%30

set /a f=%random%%%14+1

Thanks!!!

[ Last edited by acaigg on 2011-1-24 at 20:10 ]

Your code is wrong. There is no system variable called random. It must be a random variable set in the script.

%RANDOM% returns any decimal number between 0 and 32767, generated by Cmd.exe.
%% is the modulus in batch set/a, that is, to get the remainder.
Using random, remainder, etc. in set/a is to make the obtained variable a regular random number.
set/a i=!random!%%30, i is a random number between 0 and 29;
set/a v=!random!%%40*2, v is an even number between 0 and 78;
set/a f=%random%%%14+1, f is a random number between 1 and 14.

Thank you very much for the explanation by Han Ye Gu Xing, which is very clear. Thank you again!!!