Question

>>>a=2+4.0 >>>b=a+2 >>>a=b-1 >>>a=2*b+a >>>print(a) a=????

Answer 1

Ответ

23.0

Решение

a = 2 + 4.0 = 6.0

b = a + 2 = 6.0 + 2 = 8.0

a = b - 1 = 8.0 - 1 = 7.0

a = 2 · b + a = 2 · 8.0 + 7.0 = 16.0 + 7.0 = 23.0

print(a) = print(23.0) = 23.0

Почему нолик в конце? Потому что в Python при операциях с разными типами результирующее число расширяется до большего. К примеру:

int + double = double, поскольку double шире в значениях, чем int

char + int = int по той же причине

Также и в нашей ситуации:

int + double = double → числа с плавающей точкой

Answer 2

Let's go through the statements one by one and update the value of a step by step:

1. a = 2 + 4.0: Here, a is assigned the value of the sum of 2 and 4.0, which is 6.0.

2. b = a + 2: Now, b is assigned the value of a + 2, and since a is currently 6.0, b becomes 6.0 + 2, which is 8.0.

3. a = b - 1: Here, a is assigned the value of b - 1, which is 8.0 - 1, and the result is 7.0.

4. a = 2 * b + a: Now, a is re-assigned a new value, which is 2 * b + a, where b is 8.0, and the current value of a is 7.0. So, a becomes 2 * 8.0 + 7.0, which is 16.0 + 7.0, resulting in 23.0.

So, after executing all the statements, the final value of a is 23.0.