# print ('Hi man,')
# python首字不能空格 會執行錯誤
# string and value
print('100'+'200')
print(100+200)
# print(100+"200") you can't calculate vlaue and string together #It's wrong.
# need to transform to the same category
print("100"+str(200))
print(int("100")+200)
print(float("100")+200)
