001-3. Operator
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# Day_01_02_operator.py
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# The kind of operators : 산술, 관계, 논리, 비트
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# 7 Operators for arithmetic : + - * / // % **
a, b = 17, 5
c = a+b
print(c)
print(a+b)
print(a-b)
print(a*b)
print(a/b)
print(a//b)
print(a%b)
print(a**b)
# 3 quotient is found by "//"
# +----
# 5 | 17
# 15
# ----
# 2 remainder is found by "%"
# Quiz
# Transpose each postition from 2 digits positive number
# For example,
# 37 --> 73
# = 3*10+7 --> 7*10+3
n = 37
a1 = n//10 # 3
a2 = n %10 # 7
# Other ordinal method to find answer
n = a2*10 + a1
print(n)
print(n%10*10 + n//10)
# 3
# +----
# 10 | 37
# 30
# ----
# 7
print('-'*50)
# 6 Operators for relation : > >= < <= == !=
print(a, b)
print(a > b)
print(a >= b)
print(a < b)
print(a <= b)
print(a == b)
print(a != b)
# Korean characters can be expressed by unicode, utf-8, euc-kr
# Alphabet characters can be expressed by ascii, unicode, utf-8, euc-kr
# 형변환(casting) : int(), float(), str(), bool()
print(int(True))
# output:1
# The following '345' is string
print('345')
# I want to convert string '345' into integer 345
print(int('345'))
print(int(a != b))
# output:1
print(int(False))
# output:0
# Quiz
# Decide if age is teen or not
age = 15
# The followings are condition to decide
b1 = age >= 10
b2 = age <= 19
# T * T ouputs T
# T * F ouputs F
# F * T ouputs F
# F * F ouputs F
print(bool(b1*b2))
# The following makes wrong result without parenthesis
# print(age >= 10 * age <= 19)
print((age >= 10) * (age <= 19))
# The following is unique Python syntax
print(10 <= age <= 19)
print(True * True)
print('-'*50)
# 3 operators for logic : and or not
# operators for logic are only used for binding "operators for relation"
# Priority : operators for relation > operators for logic
print(True and True )
print(True and False)
print(False and True )
print(False and False)
print(age >= 10 and age <= 19)
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