practice2.py

#整數
print(8888)
#二進位0b
print(0b001)
print(0b010)
print(0b011)
#八進位0o
print(0o010)
print(0o011)
#十六進位0x
print(0x0011)
print(0x000F)
#int轉型
print(int(True))
print(int(False))

#整數無窮大小 階乘
num = int(input("n!=? input n="))
factorial = 1
#check integer and not negative
if num < 0:
    print("not negative")
elif num == 0:
    print()
else:
    for i in range(1,num + 1):
        factorial = factorial*i
    print("%d! = %d" %(num,factorial))