program to check given number is prime or not, even or odd, polindrome or not

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
class cplus
{
		int i,j,n;
	public:
		void prime();
		void even_odd();
		void polin();
};
       void cplus::prime()
       {
	int count;
	cout<<"enter n:";
	cin>>n;
	for(j=2;j<=n;j++)
	{
		count=0;
		for(i=1;i<=j;i++)
		{
			if(j%i==0)
			count++;
		}
		if(count==2)
		cout<<j<<"\t";
	}
	}
	void cplus::even_odd()
	{
		cout<<"enter n:";
		cin>>n;
		cout<<"\neven nos:";
		for(i=1;i<=n;i++)
		{
			if(i%2==0)
			cout<<"\t"<<i;
		}
		cout<<"\nodd nos:";
		for(i=1;i<=n;i++)
		{
			if(i%2!=0)
			cout<<"\t"<<i;
		}
	}
	void cplus::polin()
	{
		int a,b=0;
		cout<<"enter n:";
		cin>>n;

		a=n;
		while(a>0)
		{
		b=b*10+a%10;
		a=a/10;
		}
		if(b==n)
		cout<<"\n"<<n<<"is a polindrom";
		else
		cout<<"\n"<<n<<"not a polindrom";
	}
	void main()
	{
		clrscr();
		cplus k;
		int ch;
		do
		{
			cout.fill('*');
			cout.width(80);
			cout<<"\ncontrol structures"<<endl;
			cout.width(80);
			cout<<"\n1.prime\n2.even-odd\n3.polindrom";
			cout<<"\nenter your choice:";
			cin>>ch;
			switch(ch)
			{
				case 1:
					k.prime();
					break;
				case 2:
					k.even_odd();
					break;
				case 3:
					k.polin();
					break;
				case 4:
					cout<<"exit";
			}
		}while(ch!=4);
	}

Categories: C++ Programming, CPP