Calculator simple calculator using java:JAVA

Save below code as calculator.java

CODE:

import javax.swing.JOptionPane;

public class calculator

{

  public static void main(String args[])

  {

    String s1,s2,s3,n1;

int op2=1;

int a,b,op1,n,i;

float re=0;

while(op2!=0)

{

n1=JOptionPane.showInputDialog("Enter what operation you want to perform using this calculator:\n1.Addition\n2.Substraction\n3.Multiplication\n4.Division\n5.Reminder\nAny other number to exit");

int op=Integer.parseInt(n1);

if((op>0)&&(op<6))

{

 switch(op)

 {

   case 1:

{

 s2=JOptionPane.showInputDialog("Enter number of values you want to add:");

 op1=Integer.parseInt(s2);

 for(i=0;i<op1;i++)

 {

   s3=JOptionPane.showInputDialog("Enter number:");

a=Integer.parseInt(s3);

re=re+a;

 }

 JOptionPane.showMessageDialog(null,"The sum of given "+op1+" values is: "+re,"Addition",JOptionPane.PLAIN_MESSAGE);

 break;

        }

        case 2:

        {

 s2=JOptionPane.showInputDialog("Enter number of values you want to subtract:");

 op1=Integer.parseInt(s2);

 for(i=0;i<op1;i++)

 { 

   if(i==0)

   { 

 s3=JOptionPane.showInputDialog("Enter number:");

 a=Integer.parseInt(s3);

 re=a;

}

            else

            {

     s3=JOptionPane.showInputDialog("Enter number:");

 a=Integer.parseInt(s3);

 re=re-a;

   }

 }

 JOptionPane.showMessageDialog(null,"The differance of given "+op1+" values is: "+re,"Substraction",JOptionPane.PLAIN_MESSAGE);

 break;

}

        case 3:

{

 s2=JOptionPane.showInputDialog("Enter number of values you want to Multiply:");

 op1=Integer.parseInt(s2);

 for(i=0;i<op1;i++)

 {  

   if(i==0)

   { 

 s3=JOptionPane.showInputDialog("Enter number:");

 a=Integer.parseInt(s3);

 re=a;

}

else

{

   s3=JOptionPane.showInputDialog("Enter number:");

a=Integer.parseInt(s3);

re=re*a;

}

 }

 JOptionPane.showMessageDialog(null,"The Product of given "+op1+" values is: "+re,"Multiplication",JOptionPane.PLAIN_MESSAGE);

 break;

        }

case 4:

{

 s2=JOptionPane.showInputDialog("Enter divident value:");

 a=Integer.parseInt(s2);

 s3=JOptionPane.showInputDialog("Enter divisor: ");

 b=Integer.parseInt(s3);

 re=(float)a/b;

 JOptionPane.showMessageDialog(null,"The result of division is: "+re,"Division",JOptionPane.PLAIN_MESSAGE);

 break;

}

        case 5:

{

 s2=JOptionPane.showInputDialog("Enter divident value:");

 a=Integer.parseInt(s2);

 s3=JOptionPane.showInputDialog("Enter divisor: ");

 b=Integer.parseInt(s3);

 re=(float)a%b;

 JOptionPane.showMessageDialog(null,"The result of division is: "+re,"Reminder",JOptionPane.PLAIN_MESSAGE);

 break;

}

      }

    }

    else

    {

      JOptionPane.showMessageDialog(null,"Calculator is terminated as you entered wrong number.","End",JOptionPane.PLAIN_MESSAGE);

 op2=0;

}

    }

  }

}  

//End of program

Program to find roots of quadratic equation using java

Save below code as roots.java


CODE:


import java.io.*;
import java.math.*;
import javax.swing.JOptionPane;
class roots
{
public static void main(String args[])
{
String n1,n2,n3;
float a,b,c,r1,r2;
double root1,root2,d;
n1=JOptionPane.showInputDialog("Enter the value of a in ax^2+bx+c=0");
n2=JOptionPane.showInputDialog("Enter the value of b in ax^2+bx+c=0");
    n3=JOptionPane.showInputDialog("Enter the value of c in ax^2+bx+c=0");
a=new Float(n1);
b=new Float(n2);
c=new Float(n3);
d=b*b-4*a*c;
if(d<0)
{  
  d=Math.sqrt(-d);
  JOptionPane.showMessageDialog(null,"The root1 is :(-"+b+"+i("+d+"))/"+2*a,"Result",JOptionPane.PLAIN_MESSAGE);
  JOptionPane.showMessageDialog(null,"The root1 is :(-"+b+"-i("+d+"))/"+2*a,"Result",JOptionPane.PLAIN_MESSAGE);
}
else
{
  root1=(Math.sqrt(d)-b)/2*a;
  root2=-(Math.sqrt(d)+b)/2*a;
  JOptionPane.showMessageDialog(null,"The root1 is "+root1,"Result",JOptionPane.PLAIN_MESSAGE);
  JOptionPane.showMessageDialog(null,"The root2 is "+root2,"Result",JOptionPane.PLAIN_MESSAGE);
    }
}     
}

//End of program

Finding roots of quadratic equations in java:JAVA

Save below code as palindrome.java


CODE:



import java.util.*;
import javax.swing.JOptionPane;
class Palindrome
{
   public static void main(String args[])
   {
      String original, reverse="";
      original=JOptionPane.showInputDialog("Enter a string to check if it is a palindrome");
      int length = original.length();
      for ( int i = length - 1 ; i >= 0 ; i-- )
 {
         reverse = reverse + original.charAt(i);
      }
 if (original.equals(reverse))
      {
   JOptionPane.showMessageDialog(null,"Entered string is a palindrome","Result",JOptionPane.PLAIN_MESSAGE);
 }
 else
      {
      JOptionPane.showMessageDialog(null,"Entered string is not a palindrome","Result",JOptionPane.PLAIN_MESSAGE);
 }   
   }
}

//End of program

Addition program in java :JAVA

Save below code as addition.java


CODE:

import javax.swing.JOptionPane;
public class addition
{
  public static void main(String args[])
  {
    String n1,n2;
int n3,n4,sum;
n1=JOptionPane.showInputDialog("Enter first Number");
n2=JOptionPane.showInputDialog("Enter second number");
n3=Integer.parseInt(n1);
n4=Integer.parseInt(n2);
sum=n3+n4;
JOptionPane.showMessageDialog(null,"The sum is "+sum,"Result",JOptionPane.PLAIN_MESSAGE);
System.exit(0);
  }
}  

//End of program

Welcome program in java :JAVA

Save below code as welcome.java


CODE:
import javax.swing.JOptionPane;
public class welcome
{
  public static void main(String args[])
  {
    JOptionPane.showMessageDialog(null,"Welcome to java Programming");
System.exit(0);
  }
}
//End of program