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project.asm
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project.asm
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;Create an assembly program that will calculate a user's choice of either combination orpermutation.
; -Your main procedure will print a menu for the user and read their input.
; factorial, combination and permutation.
; -Factorial should be a recursively defined procedure that takes an integer argument
; (passed on the stack) and returns it's factorial.
; -The combination and permutation procedures will use the factorial procedure
; that you create in order to perform their calculations.
; -After each selection the user should be asked if they would like to perform another operation.
; -If they enter "yes" (not just 'y') they should be able to continue.
; -Otherwise, the program should exit
extern printf
extern scanf
SECTION .data
menu: db "0: Factorial", 10, "1: combonation", 10, "2: permutation", 10, "Choice: ", 0
promptN: db "Enter N value: ", 0
promptR: db "Enter R value: ", 0
promptNum db "Enter number: ", 0
playagain: db "Play again: ", 0
numfmt: db "%d", 0
stringfmt: db "%s", 0
N: dq 0
R: dq 0
num: dq 0
choice: db 0
again: db " ", 0
comboMsg: db "nCr: %ld", 10, 0
permMsg: db "nPr: %ld", 10, 0
factMsg: db "Factorial: %ld", 10, 0
yesString: db "yes", 0
SECTION .text
global main
main:
menustart: ; Label for start of loop
mov rdi, menu
mov rsi, 0
mov rax, 0
call printf
mov rdi, numfmt
mov rsi, choice
mov rax, 0
call scanf
; scanf("%d", &choice)
cmp BYTE [choice], 1 ; Compare user input to decide what function to run
je combostart
jg permstart
jl factstart
factstart: ; function for input and output of factorial
mov rdi, promptNum ; move the prompt to RDI (1st parameter loc)
mov rax, 0
call printf ; call extern printf proc
; printf("Enter num: ")
mov rdi, numfmt ; move input format to rdi
mov rsi, num ; move location of ans var to rsi
mov rax, 0
call scanf ; call scanf
push QWORD [num] ; Push num to stack
call fact ; call factorial function
mov rsi, rax ; set up print statement
mov rdi, factMsg
mov rax, 0
call printf
jmp restart ; jump to restart
combostart:
mov rdi, promptN ; move the prompt to RDI (1st parameter loc)
mov rsi, 0
mov rax, 0
call printf ; call extern printf proc
; printf("Enter num: ")
mov rdi, numfmt ; move input format to rdi
mov rsi, N ; move location of N var to rsi
mov rax, 0
call scanf ; call scanf
; scanf("%d", &ans)
mov rdi, promptR ; move the prompt to RDI (1st parameter loc)
mov rsi, 0
mov rax, 0
call printf ; call extern printf proc
; printf("Enter num: ")
mov rdi, numfmt ; move input format to rdi
mov rsi, R ; move location of R var to rsi
mov rax, 0
call scanf ; call scanf
; scanf("%d", &ans)
push QWORD [R] ; push contents of R to stack
push QWORD [N] ; push contents of N to stack
call combo ; call combo function
mov rdi, comboMsg ; printf stuff for combonation answer
mov rsi, rax
mov rax, 0
call printf
; printf("nCr: %ld\n", combo(N,R));
jmp restart
permstart:
mov rdi, promptN ; move the prompt to RDI (1st parameter loc)
mov rsi, 0
mov rax, 0
call printf ; call extern printf proc
; printf("Enter num: ")
mov rdi, numfmt ; move input format to rdi
mov rsi, N ; move location of N var to rsi
mov rax, 0
call scanf ; call scanf
; scanf("%d", &N)
mov rdi, promptR ; move the prompt to RDI (1st parameter loc)
mov rsi, 0
mov rax, 0
call printf ; call extern printf proc
; printf("Enter num: ");
mov rdi, numfmt ; move input format to rdi
mov rsi, R ; move location of R var to rsi
mov rax, 0
call scanf ; call scanf
; scanf("%d", &R)
push QWORD [R] ; push contents of ans to stack
push QWORD [N]
call permu ; call factorial function
mov rdi, permMsg ; printf stuff for permutation answer
mov rsi, rax
mov rax, 0
call printf
; printf("nPr: %d", perm(N,R));
restart:
mov rdi, playagain ; prompt user if they want to play again
mov rax, 0
call printf
; printf("Play again: ");
mov rdi, stringfmt ; getting input
mov rsi, again
mov rax, 0
call scanf
; scanf("%s", &again);
; compare string code
lea rsi, [again]
lea rdi, [yesString]
mov rcx, 4
rep cmpsb
jne out
stringsMatch:
jmp menustart
out:
mov eax, 1 ; 1 is code for exit (Tested in Linux)
int 0x80 ; call kernel
; Returns factorial of pushed num
fact:
push rbp
mov rbp, rsp
mov rax, [rbp + 16]
cmp rax, 1
jle end
dec rax
push rax
call fact
mov rbx, [rbp + 16]
mul rbx
end:
mov rsp, rbp
pop rbp
ret
combo:
push rbp
mov rbp, rsp ; Stack frame
mov r14, [rbp + 16] ; n
mov rcx, [rbp + 24] ; r
push r14 ; push n
call fact ; call func
mov r15, rax ; move n! to r15
pop r14 ; pop n (rdx) into rdx
push rcx
call fact
pop rcx
mov r12, rax ; move r! to r12
sub r14, rcx ; (n-r) in r15
push r14 ; (n-r)! call
call fact
pop r14
mov r13, rax ; move (n-r)! to r13
mov rax, r12 ; move r! to rax
mul r13 ; r!(n-r)! to rax
mov r14, rax ; move r!(n-r)! to r14 (overwrites n)
mov rax, r15 ; move n! to rax
div r14 ; do division, result is in rax
mov rsp, rbp
pop rbp
ret
permu:
push rbp
mov rbp, rsp ; Stack frame
mov r14, [rbp + 16] ; n
mov rcx, [rbp + 24] ; r
push r14 ; push n
call fact ; call func
mov r15, rax ; move n! to r15
pop r14 ; pop n into r14
push rcx
call fact
pop rcx
mov r12, rax ; move r! to r12
sub r14, rcx ; (n-r) in r14
push r14 ; (n-r)! call
call fact
pop r14
mov r13, rax ; move (n-r)! to r13
mov rax, r15 ; move n! to rax
div r13 ; do division, result is in rax
mov rsp, rbp ; restore stack frame before exit
pop rbp
ret