WAP to calculate square root

/*WAP to calculate square root*/

import java.lang.*;
class sqrt
{
 public static void main(String arg[])
   {
    double n,x;
    x=4;
    n = Math.sqrt(x);
    System.out.println("Sqrt Root is "+ n);
   }
}

WAP to calculate square

/*WAP to calculate square*/

import java.lang.*;
class sqr
{
 int n,sqr;
 sqr(int n1)
  {
   n=n1;
  }
 void calculate()
    {
     sqr=n*n;
    }
 void display()
    {
     System.out.println("squar=" + sqr);
    }
}
class demo_sqr
{
 public static void main(String arg[])
   {
   sqr s1=new sqr(3);
   s1.calculate();
   s1.display();
   }
}

wap to construct rectengle class with "this" pointer

/*wap to construct rectengle class with "this" pointer*/

import java.lang.*;
class rectangle
{
 int l,b;
 rectangle(int a,int c)
    {
     this.l=a;
     
     this.b=c;
    }
 void display()
    {
     System.out.println("length is="+l);
     System.out.println("breadth is="+b);     
    }
}
class demo_thisrec
{
 public static void main(String arg[])
   {
    rectangle r1=new rectangle(3,4);
    r1.display();
   }
}

wap to construct rectengle class

/*wap to construct rectengle class having data member breadth&
length & make constractor*/

import java.lang.*;
class rectangle
{
 int l,b;
 rectangle(int a,int c)
    {
       l=a;
       b=c;
    }
 void display()
    {
     System.out.println("length is="+l);
     System.out.println("breadth is="+b);     
    }
}
class demo_rectangle
{
 public static void main(String arg[])
   {
    rectangle r1=new rectangle(3,4);
    r1.display();
   }
}

WAP to check no. is prime/not

/*WAP to check no. is prime/not*/

import java.lang.*;

class prime
   {
    int num,count;
    prime(int num1)
      {
       num=num1;
       count=0;
      }
    void calculate_prime()
      {
       for(int i=1;i        {
         if(num%i==0)
         count++;
         if(count>2)
         break;
        }
      }
   void display()
     {
      if(count>2)
      System.out.println("not prime " + num);
      else
      System.out.println("prime " + num);
     }
   }


class demo_prime
   {
    public static void main(String arg[])
      {
       prime p1=new prime(5);
       prime p2=new prime(21);

       p1.calculate_prime();
       p1.display();

       p2.calculate_prime();
       p2.display();
      }
   }

wap to calculate factorial

/*wap to calculate factorial*/

import java.lang.*;
class factorial
{
 int num;
 factorial(int a)
    {
     num=a;
    }
 int fact(int m)
   {
    if(m==0)
    return(1);
    else
    return(m*fact(m-1));
   }
 void display()
    {
     int f;
     f=fact(num);
     System.out.println("factorial is="+f);
    }
}
class demo_factorial
{
 public static void main(String arg[])
   {
    factorial f1=new factorial(3);
    f1.display();
   }
}