#include <iostream>
using namespace std;
int main()
{
double a;
while(cin>>a)
{
double circle=0;
double area=0;
if(a==0)
{break;}
circle=4*a;
area=a*a;
cout<<"周長是:"<<circle<<endl;
cout<<"面積是:"<<area<<endl;
}
return 0;
}
第二:
#include <iostream.h>
class Temp
{
private:
double a;
public:
Temp(double x);
~Temp();
void show();
};
Temp::Temp(double x)
{
a=x;
}
Temp::~Temp()
{
}
void Temp::show()
{
cout<<"周長是:"<<4*a<<endl;
cout<<"面積是:"<<a*a<<endl;
}
int main()
{
double m;
cin>>m;
Temp o(m);
o.show();
return 0;
}
第三:
#include <iostream>
using namespace std;
class Temp
{
private:
double a;
public:
Temp();
void DeTemp(double x=0);
~Temp();
void show();
};
Temp::Temp()
{}
void Temp::DeTemp(double x)
{
a=x;
}
Temp::~Temp()
{}
void Temp::show()
{
cout<<"周長是:"<<4*a<<endl;
cout<<"面積是:"<<a*a<<endl;
}
int main()
{
double m;
cin>>m;
Temp o;
o.DeTemp(m);
o.show();
return 0;
}
第四:
#include <iostream>
using namespace std;
void temp(double m)
{
cout<<"周長是:"<<4*m<<endl;
cout<<"面積是:"<<m*m<<endl;
}
int main()
{
double a;
cin>>a;
temp(a);
return 0;}