102740: [AtCoder]ABC274 A - Batting Average

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

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，用指定的位数显示击球手的平均击球率。

存在整数 $A$ 和 $B$，满足 $1 \leq A \leq 10$ 和 $0 \leq B \leq A$。
将以下方式获得的字符串记为 $S$。

• 将 $\dfrac{B}{A}$ 四舍五入到三位小数，然后按顺序写出整数部分（1位）、.（小数点）和小数部分（3位），后跟0。

例如，如果 $A=7$ 和 $B=4$，则 $\dfrac{B}{A} = \dfrac{4}{7} = 0.571428\dots$ 四舍五入到三位小数是 $0.571$。因此，$S$ 为 0.571。

您将通过输入获得 $A$ 和 $B$，并被要求打印 $S$。

约束条件

• $1 \leq A \leq 10$
• $0 \leq B \leq A$
• $A$ 和 $B$ 是整数。

输入

输入以标准输入的以下格式给出：

$A$ $B$

输出

以问题描述中指定的格式打印 $S$。 请注意，不同格式的答案将被视为错误。

样例输入 1

7 4

样例输出 1

0.571

如问题描述中所述，$\dfrac{B}{A} = \dfrac{4}{7} = 0.571428\dots$ 四舍五入到三位小数是 $0.571$。因此，$S$ 为 0.571。

样例输入 2

7 3

样例输出 2

0.429

$\dfrac{B}{A} = \dfrac{3}{7} = 0.428571\dots$ 四舍五入到三位小数是 $0.429$。（请注意，它被四舍五入了。）
因此，$S$ 为 0.429。

样例输入 3

2 1

样例输出 3

0.500

$\dfrac{B}{A} = \dfrac{1}{2} = 0.5$ 四舍五入到三位小数还是 $0.5$。
因此，$S$ 为 0.500。请注意，必须有三位小数。

样例输入 4

10 10

样例输出 4

1.000

样例输入 5

1 0

样例输出 5

0.000