Using a random number generator in MIPS? -


so reading few threads on site , found 1 on how make one.. can't find link explains more how code it.. textbook course didn't provide information rng @ no there.

the code 

li $a1, 4 li $v0, 42 add $a0, $a0, 1

is correct asking range between 1-3? tried outputting random number gave me same number constantly.

#sw $a0, 0($s0) li $a1, 4 li $v0, 42 add $a0, $a0, 1 #syscall  li $v0, 4 la $a0, checking syscall  li $v0, 1 move $t0, $a0 syscall

i saw sw $a0, 0($s0) i'm not sure -- needed output? (i took out because after pushed key go rng, said program crashed) keep getting output of 268501267 i'm not sure means edit: started giving me 268500992 time

can explain little more in depth?

logically speaking -- understand 42 comes , why need add +1 (this won't value of 0)

from there, have no clue on why code won't output number in range gave.

as stated mars documentation (help > syscalls):

random int 41 $a0 = i.d. of pseudorandom number generator (any int). $a0 contains next pseudorandom, uniformly distributed int value random number generator's sequence

so

li $v0, 41         ; service 41, random int xor $a0, $a0, $a0  ; select random generator 0 syscall            ; generate random int (returns in $a0)  li $v0, 1  ; service 1, print int syscall    ; print generated random int

works fine me, every time different number printed.


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