Batting Average | 程序员灯塔

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 $dfrac{B}{A} = dfrac{4}{7} = 0.571428dots$ 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, $dfrac{B}{A} = dfrac{4}{7} = 0.571428dots$ rounded off to three decimal digits is $0.571$. Thus, $S$ is 0.571.

Sample Input 2

7 3

Sample Output 2

0.429

$dfrac{B}{A} = dfrac{3}{7} = 0.428571dots$ 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

直接按题意模拟，输出 (frac{a}{b})，保留三位即可。

#include<cstdio>
int a,b;
int main()
{
	scanf("%d%d",&a,&b);
	printf("%.3lf",1.00*b/a);
}

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