4005 - 入门第一次考试 第5题

2

周长=12.56
面积=12.56

C语言解答

#include<stdio.h>
#include<math.h>
const double Pi = 3.14;
double Area( double Redius )
{
	double Are;
	Are = Pi * pow( Redius, 2 );
	return Are;
}
double Circumference( double Redius )
{
	double Cir;
	Cir = 2 * Pi * Redius;
	return Cir;
}
int main( int argc, char **argv )
{
	double Redius;
	scanf( "%lf", &Redius );
	double Are,Cir;
	Are = Area( Redius ), Cir = Circumference( Redius );
	printf( "周长=%.2f\n面积=%.2f\n", Cir, Are );
	return 0;
}

C++解答

//计算周长面积 
#include <iostream>
using namespace std;

int main ()
{
  float r, c, s;
  cin>>r;

  c = 3.14*r*2;
  s = 3.14*r*r;


  // 打印结果 
  cout <<"周长="<<c<<endl;
  cout <<"面积="<<s<<endl;
  // 结束程序 
  return 0;
}