Random script giving an unexpectly expected result

[16-bit Fighter]

I created an none object meant to load randomly an item among four possible ones. It's very strange for me what happens and I'll give as much as details possible to explain.

The issue is the result is the same when I start for the first time a stage. It changes following the stage but in each stage as its own result. When I endgame to restart the same level, at last I obtain another result: a kind of real random one. But if I quit OpenBor and restart the game, each stage really has its own expected result.
When I test with several random items in a screen, each item has its own expected result as well. If I add another one its result will depend on where it is in the content of the file, not where it is in the screen. By example, if 5 random items gives 42131, a 6th added one will have 4 if I put as the first in the text (while the ex first random item after becoming the 2nd will have 2 and the ex second random item after becoming the 3th will have 1, and so on) but it will have 1 if it is the 5th.

Now here is the script:

name        powerx3
type        none
lifespan    5
animationscript    data/scripts/player.c
load         powera
load         powerb
load    powerc
load         powerd

anim    idle
@script
    if(frame == 0){
      void self = getlocalvar("self");
    int r = rand()%20+20;

        if(r < 10){
          changeentityproperty(self, "animation", openborconstant("ANI_FOLLOW1"));
        } else if(r < 20){
          changeentityproperty(self, "animation", openborconstant("ANI_FOLLOW2"));
        } else if(r < 30){
          changeentityproperty(self, "animation", openborconstant("ANI_FOLLOW3"));
        } else if(r < 40){
          changeentityproperty(self, "animation", openborconstant("ANI_FOLLOW4"));
        }
    }
@end_script
    delay    1
    offset    8 14
    frame    data/chars/misc/empty.gif
    frame    data/chars/misc/empty.gif
    delay    250
    frame    data/chars/misc/empty.gif
    delay    250
    frame    data/chars/misc/empty.gif

anim    follow1
    delay    1
    offset    8 14
    frame    data/chars/misc/empty.gif
    delay    200
    @cmd    spawn01 "powera" 0 0 0
    frame    data/chars/misc/empty.gif

anim    follow2
    delay    1
    offset    8 14
    frame    data/chars/misc/empty.gif
    delay    200
    @cmd    spawn01 "powerb" 0 0 0
    frame    data/chars/misc/empty.gif
 
anim    follow3
    delay    1
    offset    8 14
    frame    data/chars/misc/empty.gif
    delay    200
    @cmd    spawn01 "powerc" 0 0 0
    frame    data/chars/misc/empty.gif
 
anim    follow4
    delay    1
    offset    8 14
    frame    data/chars/misc/empty.gif
    delay    200
    @cmd    spawn01 "powerd" 0 0 0
    frame    data/chars/misc/empty.gif

Anyone has an idea what's wrong please? I mean I obviously want a random effect from the start. ^^

 

[hechelion]

When you start the first stage, modify the random number generator seed with:

srand(seed)

You can use the "ticket" counter as the seed; it's not ideal, but it usually works fine.

srand(openborvariant("ticks"));

There are more complex and better ways to generate a seed so that the result "feels" more random, but in general, the human variation between starting the engine and you starting to play usually has a variation that works.

In version 4-7533, without needing to modify the seed, I get random numbers. I couldn't tell you the root of the problem, but I understand that by default, OpenBOR doesn't always use the same seed, so perhaps somewhere you're initializing the seed with the same value?