when I tried to run this code two windows popped up and say
unknown system call: 40
and
unknown system call: 42
I suspect that this is not about the system calls themselves, but i'm not sure either. This is my first time writing with the MIPS assembly language so please let me now if there is anything I didn't do correctly in the code below.
.data
line1: .asciiz "Enter a maximum number"
line2: .asciiz "Enter a seed"
line3: .asciiz "Enter a guess"
line4: .asciiz "NO"
line5: .asciiz "YES"
.text
.globl main
main:
li $v0, 4
la $a0, line1
syscall # output line 1
li $v0, 5
syscall
move $s0, $v0 # User input moved to s0
li $v0, 4
la $a0, line2 # output line 2
syscall
li $v0, 5
syscall
move $s1, $v0 # User input moved to s1
li $v0, 40 # Creating a seed for the random number generator with user input
add $a0, $zero, 0
add $a1, $zero, $s0
syscall
li $v0, 42 # Creating the random number generator with user input
add $a0, $zero, 0
add $a1, $zero, $s1
syscall
move $s2, $a1
li $v0, 1
move $a0, $s2
syscall
li $v0, 10
syscall
Spim is a limited number of system calls: http://students.cs.tamu.edu/tanzir/csce350/reference/syscalls.html so when using spim, using anything outside of them will not work.
The mars simulator has more calls: http://courses.missouristate.edu/kenvollmar/mars/help/syscallhelp.html with the 40 and 42 syscalls being amongst them.
So if you want to use those system calls, you must use the mars simulator.