; Factorial

       JMP start
N:     DB 5 ; Variable to take factorial of
Fact:  DB 1 ; Factorial

start:
	MOV A, [Fact] ;  calculate fact in reg. A
	MOV B, [N] ; variable N to reg. B
	MOV C, 1 ; counting variable
	
	CMP B, 0 ; if variable is 0, fact is 1
	JE .bot ; jump to end
	CMP B, 1 ; if variable is 1, fact is 1
	JE .bot ; jump to end 
.top:
	INC C ; increment counter
	MUL C ; multiply A by C answer goes into A
	CMP B, C ; Check if end 
	JNZ .top ; jump if not
.bot:

	HLT