P8869 [ChuanZhi Cup #5 Preliminary] A - Lianzi’s Software Engineering

Under the bombardment of cosmic rays, some of the functions that Lianzi had predefined on her computer were damaged. For a science student, various software tools are very important in study and research. To restore the normal use of the software on her computer as soon as possible, she needs to rewrite some of these functions quickly.

Specifically, given two integers $a, b$, with $b \neq 0$ guaranteed, Lianzi wants to implement a function $\operatorname{fun}(a,b)$ that transfers the sign of $b$ onto $a$. More precisely, $\operatorname{fun}(a,b)=\operatorname{sgn}(b)\times |a|$, where $\operatorname{sgn}(b)=\begin{cases}1&b>0\\-1&b

- A single line containing two integers $a, b$.

- A single line containing one integer, the value of $\operatorname{fun}(a,b)$.

For all testdata, $a$ and $b$ are within the range of 32-bit signed integers, and $b \neq 0$. Translated by ChatGPT 5