(20)Write a Program to display prime no between 1 to N number in CPP

#include<iostream.h> #include<conio.h> class primen {  int a,n,no,c,m;  public:   void insert();   void display();   };   void primen::insert()   {    cout<<"\n\t\tEnter Number:";    cin>>m;   }   void primen::display()   {   a=1;    while(a<=m)    {     c=0;     no=a;     n=1;     while(n<=no)     {      if(no%n==0)      {        c=c++;       }       n++;     }     if(c==2)     {      cout<<a;     }     a++;     } } void main() {  clrscr();  primen pp;  pp.insert();  pp.display();  getch();  }

(19) Wap to display Armstrong No between 1 To N Number in Cpp

#include<iostream.h> #include<conio.h> class armstrongn {        long int m;        int a,n,r,c,no;        public:               void getdata();               void putdata(); }; void armstrongn :: getdata() {        cout<<"\n\t\t Enter Number : ";        cin>>m; } void armstrongn :: putdata() {        a=1;        while(a<=m)        {               no=a;               c=no;               r=0;               while(no>=1)               {                      n=no%10;                      r=r+(n*n*n);                      no=no/10;               }               if(c==r)                      cout<<r<<"  ";               a++;        } } void main() {        clrscr();        armstrongn r1;        r1.getdata();        r1.putdata();        getch(); }

v  Output

Enter Number : 1000 1 153 370 371 407

(18)Write a programm to display palindrom No between 1 To N Number in CPP

v  Program

#include<iostream.h> #include<conio.h> class palindromn {        int a,n,m,r,c,no;        public:               void getdata();               void putdata(); }; void palindromn :: getdata() {        cout<<"\n\t\t Enter Number : ";        cin>>m; } void palindromn :: putdata() {        a=1;        while(a<=m)        {               no=a;               c=no;               r=0;               while(no>=1)               {                      n=no%10;                      r=(r*10)+n;                      no=no/10;               }               if(c==r)                      cout<<r<<"  ";               a++;        } } void main() {        clrscr();        palindromn r1;        r1.getdata();        r1.putdata();        getch(); }

v  Output

Enter Number : 30 1 2 3 4 5 6 7 8 9 11 22