Score : $100$ points

问题描述

高桥正在制作一款电脑棒球游戏。
他将编写一个程序，以指定的位数显示击球手的打击率。

存在整数 $A$ 和 $B$，满足 $1 \leq A \leq 10$ 和 $0 \leq B \leq A$。
令 $S$ 为通过以下方式获得的字符串：

• 将 $\dfrac{B}{A}$ 四舍五入到三位小数，然后按照整数部分（1位数字）、.（小数点）和小数部分（3位数字）的顺序书写，不足部分用零填充。

例如，若 $A=7$ 且 $B=4$，则有 $\dfrac{B}{A} = \dfrac{4}{7} = 0.571428\dots$，将其四舍五入到三位小数是 $0.571$。因此，$S$ 是 0.571。

给定输入的 $A$ 和 $B$，要求你输出 $S$。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

Takahashi is making a computer baseball game.
He will write a program that shows a batter's batting average with a specified number of digits.

There are integers $A$ and $B$, which satisfy $1 \leq A \leq 10$ and $0 \leq B \leq A$.
Let $S$ be the string obtained as follows.

• Round off $\dfrac{B}{A}$ to three decimal digits, then write the integer part ($1$ digit), . (the decimal point), and the decimal part ($3$ digits) in this order, with trailing zeros.

For example, if $A=7$ and $B=4$, then $\dfrac{B}{A} = \dfrac{4}{7} = 0.571428\dots$ rounded off to three decimal digits is $0.571$. Thus, $S$ is 0.571.

You are given $A$ and $B$ as the input and asked to print $S$.

Constraints

• $1 \leq A \leq 10$
• $0 \leq B \leq A$
• $A$ and $B$ are integers.

Input

The input is given from Standard Input in the following format:

$A$ $B$

Output

Print $S$ in the format specified in the Problem Statement. Note that answers in different formats will be considered wrong.

Sample Input 1

7 4

Sample Output 1

0.571

As explained in the Problem Statement, $\dfrac{B}{A} = \dfrac{4}{7} = 0.571428\dots$ rounded off to three decimal digits is $0.571$. Thus, $S$ is 0.571.

Sample Input 2

7 3

Sample Output 2

0.429

$\dfrac{B}{A} = \dfrac{3}{7} = 0.428571\dots$ rounded off to three decimal digits is $0.429$. (Note that it got rounded up.)
Thus, $S$ is 0.429.

Sample Input 3

2 1

Sample Output 3

0.500

$\dfrac{B}{A} = \dfrac{1}{2} = 0.5$ rounded off to three decimal digits is again $0.5$.
Thus, $S$ is 0.500. Note that it must have three decimal places.

Sample Input 4

10 10

Sample Output 4

1.000

Sample Input 5

1 0

Sample Output 5

0.000

update @ 2024/3/10 11:32:00