不間斷 Python 挑戰 Day 3 - 基本數學運算

四則運算

# addition
integer_x = 1 + 2　　　　　 # integer_x = 3
integer_x = integer_x + 1　 # integer_x = 3 + 1 = 4
integer_x += 1 　 # integer_x = 4 + 1 = 5
print(integer_x)

# subtraction
integer_x = 5 - 2 　　 # integer_x = 5 - 2 = 3
integer_x = integer_x - 1　　# integer_x = 3 - 1 = 2
integer_x -= 1 　　 # integer_x = 2 - 1 = 1
print(integer_x)

# multiplication
integer_x = 1 * 2 　　 # integer_x = 1 * 2 = 2
integer_x = integer_x * 2　　# integer_x = 2 * 2 = 4
integer_x *= 2 　　 # integer_x = 4 * 2 = 8
print(integer_x)

# division
integer_x = 8 / 2 　　# integer_x = 8 / 2 = 4.0
integer_x = integer_x / 2 # integer_x = 4.0 / 2 = 2.0
integer_x /= 2 　　 # integer_x = 2.0 / 2 = 1.0
print(integer_x)
print(type(integer_x))

5
1
8
1.0
<class 'float'>

商數和餘數

# quotient
integer_x = 5 // 2 # 5 / 2 = 2 ... 1
print(integer_x)

integer_x = 5
integer_x //= 2
print(integer_x)

# remainder
integer_x = 5 % 2 # 5 / 2 = 2 ... 1
print(integer_x)

integer_x = 5
integer_x %=2
print(integer_x)

2
2
1
1

次方

# exponent
integer_x = 2 ** 3 # integer_x = 2 ^ 3 = 8
print(integer_x)

integer_x = 2
integer_x **= 3
print(integer_x)

8
8

運算的優先順序

程式範例