class StackArray(object):

    """
    Perbandingan sintaks Python dan Java
    - self = this
    - def = function
    - None = null
    """
    def create_stack(self, panjang):
        self.panjang = panjang
        self.stack = [None for x in range(0, panjang)]

    def destroy_stack(self):
        self.stack = None

    def push(self, nilai):
        if type(self.stack) != None:
            if self.is_empty() == True:
                for indeks in range(0, self.panjang):
                    if self.stack[indeks] == None:
                        self.stack[indeks] = nilai
                        break
            else:
                print "Stack sudah penuh, saat ini tidak bisa memasukkan nilai ke stack!"
        else:
            print "Stack sudah dihapus, tidak bisa memasukkan nilai ke stack!"

    def pop(self):
        if type(self.stack) != None:
            for indeks in range(self.panjang-1, -1, -1):
                if self.stack[indeks] != None:
                    self.stack[indeks] = None
                    break
        else:
            print "Stack sudah dihapus, tidak bisa memasukkan nilai ke stack!"

    def is_empty(self):
        status = False
        for indeks in range(0, self.panjang):
            if self.stack[indeks] == None:
                status = True

        return status

    def size(self):
        count_nilai = 0
        for indeks in range(0, self.panjang):
            if self.stack[indeks] != None:
                count_nilai = count_nilai + 1
        return count_nilai

    def show(self):
        for indeks in range(self.panjang-1, -1, -1):
            print self.stack[indeks]


my_stack = StackArray()
my_stack.create_stack(10)
my_stack.push(10)
my_stack.push(20)
my_stack.push(30)
my_stack.push(40)
my_stack.push(50)
my_stack.push(60)
my_stack.push(70)
my_stack.push(80)
my_stack.push(90)
my_stack.push(100)
my_stack.push(110)
my_stack.push(120)

print my_stack.size()
my_stack.show()

my_stack.pop()

print my_stack.size()
my_stack.show()

my_stack.pop()

print my_stack.size()
my_stack.show()