Rokua U2641 Wood (area)--s.b.s.

Topic background

Once a year the summer camp starts again, Kakashi and the small partners have already prepared, is filled with anticipation this joyful journey. In a sunny morning, kakashi under the leadership of the teacher came to the first stop of the summer camp-"Magic wood processing plant."

Title Description

This wood processing plant is very special, the workers only made

As round and rectangular planks, the factory's measuring workers need to calculate the area of each finished plank every day

In order to count the amount of wood used. If it is a circular plank, they only need to measure the length of the radius;

If it is a rectangular plank, only the length of the two sides (in centimeters) needs to be measured. To the worker Master

, measuring is a simple matter, but calculating the plank area is a repetitive and tedious thing,

Looking at the measurement of the workers ' faces, Kakashi anxious, dear children, can you help

Help Kaka West, to measure the workers to solve this problem?

Input/output format

Input format:

Input: There are two lines of input data. The first line is a positive integer m, which represents the measured plank shape (1 indicates the circle

The second line has several numbers, if m=1, the second line gives the circular

Radius A (Specify PI to take 3.14); if m=2, the second line gives the rectangle length and width, A, a, b

(The middle is separated by a space).

Output format:

Output: Plank area. (The final output is rounded to 2 digits after the decimal point)

Input and Output Sample input example # #:

Sample # # of output:

Output 1: (area.out) 28.26

Input Sample #:

Output Example #:

Output 2: (area.out) 12.00

Description

Data range:

0≤ Plank Edge Length or radius ≤500

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1#include <iostream>2#include <cstdio>3#include <cstring>4#include <cmath>5#include <algorithm>6#include <queue>7#include <cstdlib>8 using namespacestd;9 intRead () {Ten     intx=0, f=1;CharCh=GetChar (); One      while(ch<'0'|| Ch>'9'){if(ch=='-') f=-1; ch=GetChar ();} A      while(ch>='0'&&ch<='9') {x=x*Ten+ch-'0'; ch=GetChar ();} -     returnx*F; - } the voidCircle (); - voidSquare (); - intMain () - { +Std::ios::sync_with_stdio (false); -     intn,m; +Cin>>N; A     if(n==1) circle (); at     if(n==2) square (); -     return 0; - } - voidCircle () - { -     Doublea,s; inCin>>A; -s=3.14*a*A; toprintf"%.2f", s); +     return; - } the voidSquare () * { $     Doublea,b,s;Panax NotoginsengCin>>a>>b; -s=a*b; theprintf"%.2f", s); +     return; A}

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Rokua U2641 Wood (area)--s.b.s.