Aim:

To implement a program that computes the factorial of a number in recursive manner.

Instructions:

The program computes the factorial of a number in recursive manner and its equivalent low-level instructions executed by the hardware. The low-level instructions used are:

rem	It performs division operation of the values contained in two registers and puts the remainder in the first register.
rcopy	Passing variable value back to caller function.
push	It pushes a variable on to the stack.
pop	It pops out the variable out of the stack
store	It stores the value from the given register to the global or local variable.
out	It prints the output value to the screen.
neq	Check if the values in two registers are different.
mul	It multiplies the values contained in two registers and puts the result in the first register.
lcopy	Local copying- used to copy the value of a variable within the same memory segment.
load	It loads a value of a global or local variable to the given register.
label	Is used to mark the position in the low-level instructions to enable jumping to the marked position.
in	It reads the input from the user and stores it in a variable.
if_true	Checks if the condition evaluated to true.
if_false	Checks if the condition evaluated to be false.
freturn	It returns the control from the called function to the caller.
fenter	It changes the control of execution to the called function.
fcall	It initiates a call to the given function.
exit	Signifies the end of program.
div	It divides the values contained in two registers and puts the result in the first register.
copy	It copies the value of a variable between segments of memory.
assign	It assigns a value to a variable