C++ Class program ,which calculates area and circumference of circle.

#include<iostream>

using namespace std;
class circle
{int radius;
public:
void setradius()
{cout<<"enter radius=";
cin>>radius;
}
int getdia()
{int d;
cout<<"diameter="<<2*radius<<endl;
}
double getarea()
{double x;
x=3.14*radius*radius;
cout<<"area="<<x<<endl;
}
double getcir()

{double cir;
cir=2*3.14*radius;
cout<<"circumference="<<cir;
}

};
int main()
{circle c;
c.setradius();
cout<<endl;
c.getdia();
cout<<endl;
c.getarea();
cout<<endl;
c.getcir();
return 0;
}

C++ ENTERING NAMES OF STUDENTS

#include<iostream>
#include<string>
using namespace std;
int main()
{ string s[5];
int i;
cout<<"enter the names"<<endl;
for(i=0;i<5;i++)
{

cin>>s[i];
}
cout<<"names are="<<endl;
for(i=0;i<5;i++)
{cout<<s[i]<<endl;
}
return 0;
}

C++ ADDITION

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
int a,b,c;
cout<<"enter first number:";
cin>>a;
cout<<"enter second number:";
cin>>b;
c=a+b;
cout<<"the sum of two number:-"<<c<<endl;
return 0;
}