I'm new in using mmix editor (we have to use it in the University) and now we have to complete this code to get the Factorial of the input , so the code is
LOC Data_Segment
GREG @
RESULT OCTA 0
INPUT OCTA 13
LOC #100
result IS $0
input IS $1
Main LDO input,INPUT
PUSHJ result,Factorial
STO result,RESULT
End TRAP 0,Halt,0
PREFIX :Factorial:
inout IS $0
[...]
:Factorial [...]
End POP 1,0
we have to complete just the [...] but it doesn't work . So I had to make some edites to get the right answer like this :
LOC Data_Segment
GREG @
RESULT OCTA 0
INPUT OCTA 13
LOC #100
result IS $0
input IS $1
count IS $2
Main LDO input,INPUT
LDO count,INPUT
SET result+1,input
SET result+2,count
PUSHJ result,Factorial
STO result,RESULT
End TRAP 0,Halt,0
PREFIX :Factorial:
inout IS $0
count IS $1
test IS $2
:Factorial SUB count,count,1
MUL inout,inout,count
CMP test,count,1
BZ test,End
JMP :Factorial
End POP 1,0
Now the next step is to use Sub-routine instead of the (MUL inout,inout,count) . And here what I did :
LOC Data_Segment
GREG @
RESULT OCTA 0
INPUT OCTA 5
LOC #100
result IS $0
input IS $1
count IS $2
Main LDO input,INPUT
LDO count,INPUT
SET result+1,input
SET result+2,count
PUSHJ result,Factorial
STO result,RESULT
End TRAP 0,Halt,0
PREFIX :Factorial:
inout IS $0
count IS $1
test IS $3
:Factorial SET inout+1,inout
SET count+1,count
PUSHJ inout,:Multiply
STO inout,inout
CMP test,count,1
BZ test,End
JMP :Factorial
End POP 1,0
PREFIX :Multiply:
inout2 IS $0
count2 IS $1
test2 IS $3
:Multiply SUB count2,count2,1
ADD inout2,inout2,inout2
CMP test2,count2,3
BZ test2,EndMul
JMP :Multiply
EndMul POP 1,0
But it gives me an infinite loop (because of the count variable).
How can I solve this?
