task2_exam_PWR_assembler

.data
    enter: .asciiz "Enter the number: "
    menu: .asciiz "\nChoose action \n[1]Add number\n[2]Display number\n[3]End: "
    empty: .asciiz "The stack is empty"

    numberFromTop: .asciiz "Number: "

    # 2 – for word and 0 – for byte
    .align 2
    #memory reservation
    stack: .space 100
.text
#$t2 will be counter
    li $t2, 0
# init stack
    la $sp, stack
.main:

menuE:
    #display menu
    la $a0, menu
    li $v0, 4
    syscall

    #choose
    li $v0,5
    syscall

    #save choose in $t0
    move $t0,$v0

    beq $t0, 1, readNumbers
    nop

    beq $t0, 2, checkStack
    nop

    end:
        li $v0,10
    syscall



  checkStack:
  #check whether stack is empty
  beq $t2, 0, emptyStack

printOneNumber:

  # display 'number'
    li $v0, 4
    la $a0, numberFromTop
    syscall

    #download numebr and display
   subi $sp, $sp, 4
    l.s $f12, 0($sp)
    li $v0, 2
   syscall

    #decrement counter
     sub $t2, $t2, 1



     j menuE
    nop



readNumbers:
    # display 'enter'
    li $v0, 4
    la $a0, enter
    syscall
    # $f0=number
    li  $v0, 6
    syscall
    # $f0 to stack
    s.s $f0, 0($sp)
    addi $sp, $sp, 4

    add $t2, $t2, 1

    j menuE
    nop


#when stack is empty
emptyStack:
    li $v0, 4
    la $a0, empty
    syscall

    j menuE
    nop