.: August 2011

Program to calculate factorial of given number in Java

/*Program to calculate factorial of given number*/

class P2
{
    public static void main(String args[])
    {
        int i , number , factorial ;
        number = 7;

        for (i=1,factorial=1 ; i<=number ; i++)
            factorial = factorial * i ;

         System.out.println("The factorial of "+number+" : "+factorial);
    }
}

Program to implement Fibonacci series in Java

/* Program to implement Fibonacci series*/

class P1
{
    public static void main(String args[])
    {
        int x , y , z = 0 ;
        System.out.println("The Fibonacci Series :\n");
        System.out.println("====================\n");
        System.out.println("0\n1");

        for (x=0,y=1 ; y<1000 ; x=z)
        {
            z = y ;
            y = x + y ;
            System.out.println(y);
        }
    }
}

Program to display first 10 even numbers and their squares

/*Program to display first 10 even numbers and their squares*/

class P3
{
    public static void main(String args[])
    {
        int n ,count=1;
        System.out.println("First 10 even numbers and their squares:\n");
        System.out.println("\nNumber\tSquare\n");
        for (n=2 ;count<=10; n=n+2)
        {
            System.out.println(n+"\t"+(n*n));
            count++;
        }
    }
}

Program to demonstrate the boolean logical operators

/* Program to demonstrate the boolean logical operators */

class BoolLogic
{
    public static void main(String args[])
    {
        boolean a = true;
        boolean b = false;
        boolean c = a|b;
        boolean d = a&b;
        boolean e = a^b;
        boolean f = (!a & b)|(a & !b);
        boolean g = !a;
        System.out.println("         a = "+a);
        System.out.println("         b = "+b);
        System.out.println("       a|b = "+c);
        System.out.println("       a&b = "+d);
        System.out.println("       a^b = "+e);
        System.out.println(" !a&b|a&!b = "+f);
        System.out.println("        !a = "+g);
    }
}

/* Program to demonstrate Bitwise Shift Operators */

class BitShift
{
    public static void main(String args[])
    {
        int A = 6, B=-6;
        System.out.println("A : "+A);
        System.out.println("B : "+B);
        System.out.println("A >> 2 : "+(A>>2));
        System.out.println("A << 1 : "+(A<<1));
        System.out.println("A >>> 1 : "+(A>>>1));
        System.out.println("B >> 1 : "+(B>>1));
        System.out.println("B >>> 1 : "+(B>>>1));
    }
}

Program to demonstrate Multiple statements within if

/* Program to demonstrate Multiple statements within if */

class IfDemo2
{
    public static void main(String args[])
    {
        int marks;
        marks = 35;

        if(marks<40)
        {
            int lessmarks=40-marks;
            System.out.println("\nSorry!!!!!you are failed");
            System.out.println("\nYou should have got "+lessmarks+" more marks");

        }
    }
}

program to demonstarte if statement

/* program to demonstarte if statement */

class IfDemo1
{
   public static void main(String args[])
   {
       int no;
       no=5;
       if(no<100)
           System.out.println("The number is less than 100!!!");
   }
}

Program to compute Permutation and Combination

Program to compute Permutation and Combination

class P4
{
    public static void main(String args[])
    {
        int i , n , r , P , C ;
        int factorial , temp , result ;

        n = 6; r=3;

                 for (i=1,factorial=1 ; i<=n ; i++)    /* Calculate n! */
            factorial = factorial * i ;

                 for (i=1,temp=1 ; i<=r ; i++)         /* Calculate r! */
            temp = temp * i ;

        for (i=1,result=1 ; i<=(n-r) ; i++)    /* Calculate (n-r)!*/
            result = result * i ;

        P = factorial / temp ;
        C = P / result ;

        System.out.println(" Permutation : "+P);
        System.out.println(" Combination : "+C);
    }
}

Program to determine grade for given marks, using switch statement

/* Program to determine grade for given marks, using switch statement*/

class GradeSwitch
{
    public static void main(String args[])
    {
        int marks,index ;
        String grade;

        marks= 83;
        index = marks/10;

        switch(index)
        {
            case 10:
            case 9:
            case 8:
                grade="Honours";
                break;
            case 7:
            case 6:
                grade="First Division";
                break;
            case 5:
                grade="Second Division";
                break;
            case 4:
                grade="Third Division";
                break;
            default:
                grade="Fail";
                break;
        }
        System.out.println("Marks : "+marks+" Grade : "+grade);
    }
}

program to determine grade for given marks

/* program to determine grade for given marks */

class Grade
{
    public static void main(String args[])
    {
        int marks = 83;
        String grade;

        if(marks > 79)
            grade="Honours";
        else if(marks>59)
            grade="First division";
            else if(marks > 49)
                grade="Second division";
                else if(marks > 39)
                    grade="Third division";
                else
                grade="Fail";

        System.out.println("Marks : "+marks+"\t Grade : "+grade);
    }
}

Program of finding out the Greatest Common Division (GCD) or the Highest Common Factor (HCF) of the given two numbers, using while loop

/* Program of finding out the Greatest Common Division (GCD) or the Highest Common Factor (HCF) of the given two numbers, using while loop*/

class GCD
{
    public static void main(String args[])
    {
        int num_1 , num_2 ;
        num_1 = 25;
        num_2 = 15;

        System.out.print("The GCD of "+num_1+" and "+num_2);

        while ((num_1!=0) && (num_2!=0))
        {
            if (num_1 > num_2)
                num_1 = num_1 - num_2 ;
            else
                num_2 = num_2 - num_1 ;
        }

        System.out.print(" is "+num_1);
    }
}

program to find the number of and sum of all integers greater than 100 and less than 200 that are divisible by 7

/* program to find the number of and sum of all integers greater
than 100 and less than 200 that are divisible by 7 */

class ForDemo4
{
    public static void main(String args[])
    {
        int no,count=0,sum=0;

        for(no=101;no>100&&no<200;no++)
            if(no%7==0)
            {
                System.out.println(" "+no+" is divisible by 7");
                sum=sum+no;
                count=count+1;
            }

        System.out.println("\n Total no. of integer between 100 to 200 that are divisible by 7 : "+count);
        System.out.println(" Sum of all integer between 100 to 200 that are divisible by 7 : "+sum);
    }
}

Program to display table of 15

/* Program to display table of 15 */

class ForDemo2
{
   public static void main(String args[])
   {
       int i = 0 ;

       System.out.println("Table of 15 -\n");

       for (i=1 ; i<=10 ; i++)
           System.out.println("15 * "+i+" : "+(15*i));
   }
}

Program to compute sum of first 20 numbers using for loop

/* Program to compute sum of first 20 numbers using for loop */

class ForDemo1
{
    public static void main(String args[])
    {
        int i , sum = 0 ;

        for (i=1 ; i<21 ; i++)
            sum = sum + i ;
        System.out.println("The sum of first twenty numbers is "+sum);
    }
}

Program to demonstrate Floating-point arithmetic

/* Program to demonstrate Floating-point arithmetic */

class FloatPoint
{
   public static void main(String args[ ])
   {
       float a=10.5F,b=6.1F;
       System.out.println("a = "+a);
       System.out.println("b = "+b);
       System.out.println("a + b = "+(a+b));
       System.out.println("a - b = "+(a-b));
       System.out.println("a * b = "+(a*b));
       System.out.println("a / b = "+(a/b));

   }
}

Program to demonstrate casting Incompatible Types

/* Program to demonstrate casting Incompatible Types */

class Casting
{
    public static void main(String args[])
    {
        byte b;
        int i = 258;
        double d = 340.142;

        System.out.println("\n Conversion of int to byte.....");
        b = (byte) i;
        System.out.println(" integer i : "+i+" is converted to byte b : "+b);

        System.out.println("\n Conversion of double to int.....");
        i = (int) d;
        System.out.println(" double d : "+d+" is converted to integer i : "+i);

        System.out.println("\n Conversion of double to byte.....");
        b = (byte) d;
        System.out.println(" double d : "+d+" is converted to byte b : "+b);
    }
}

program to check whether number is even or odd

/* program to check whether number is even or odd */

class EvenOdd
{
    public static void main(String args[])
    {
        int no , temp ;
        no = 35;

        temp = no % 2 ;
        if (temp == 0)
            System.out.println("The number "+no+" is Even");
        else
            System.out.println("The number "+no+" is Odd");
    }
}

Program to tests whether the given number is divisible by 3 and 5, both

/* Program to tests whether the given number is divisible by 3 and 5, both */

class Divby3_5
{
    public static void main(String args[])
    {
        int no ;
        no = 15;

        if (no%3 == 0)
                  if (no%5 == 0)
                       System.out.println("The number "+no+" is divisible by 3 and 5");
    }
}

Program to find Factorial of number

/* Program to find Factorial of number */

class Demo
{
    public static void main(String args[])
    {
        int fact=1;
        for(int num=5;num>=1;num--)
        {
            fact*=num;
        }
        System.out.println("Factorial of 5 is :"+fact);
    }
}

Program to demonstrate continue statement with a label

/* Program to demonstrate continue statement with a label */

class ContinueDemo2
{
   public static void main(String args[])
   {
      OUTER:for(int i =0;i<10;i++)
       {
           for(int j =0;j<10;j++)
           {
           if(j>i)
           {
                System.out.println();
                continue OUTER;
           }
           System.out.print(" "+(i*j));
           }
       }
        System.out.println();
   }
}

Program to demonstrate continue statement

/* Program to demonstrate continue statement */

class ContinueDemo1
{
    public static void main(String args[])
    {
        for(int i =0;i<10;i++)
        {
            System.out.print(i+" ");
            if(i%2==0) continue;
            System.out.println("");
        }
    }
}

Program to illustrate the command-line arguments

/* Program to illustrate the command-line arguments */

class CommandLineDemo
{
    public static void main(String args[])
    {
        for(int i =0;i<args.length;i++)
            System.out.println("args["+i+"]: "+args[i]);
    }
}

Program to demonstrates Call by Value

/* Program to demonstrates Call by Value */

class Sample
{ int c,d;


    void cal(int c, int d)
    {

        c=c+2;
        d=d-2;

    }
}

class CallByValue
{
    public static void main(String args[])
    {
        Sample s=new Sample();
        int p=20,q=10;

        System.out.println(" p and q Before call :"+p+", "+q);

        s.cal(p,q);

        System.out.println(" p and q After call :"+p+", "+q);
    }
}

Program to demonstrates Call by reference

/* Program to demonstrates Call by reference */

class Sample
{
    int p,q;

    Sample(int x,int y)
    {
        p=x;
        q=y;
    }

    // Pass an Object
    void cal(Sample obj)
    {
        obj.p=obj.p+2;
        obj.q=obj.q-2;
    }
}

class CallByRef
{
    public static void main(String args[])
    {
        Sample s=new Sample(20,10);

        System.out.println(" p and q Before call : "+s.p+", "+s.q);

        s.cal(s);

        System.out.println(" p and q After call : "+s.p+", "+s.q);
    }
}

Program that uses break as a civilized form of goto

/* Program that uses break as a civilized form of goto */

class BreakDemo3
{
    public static void main(String args[])
    {
        boolean b = true;

        FIRST: {
            SECOND : {
                THRID : {
                    System.out.println("Before break....");
                    if(b) break SECOND ; //break out of second block
                    System.out.println("This won't execute....");
                    }
                    System.out.println("This won't execute....");
                }
            System.out.println("This is after SECOND block....");
            }
    }
}

Program that uses break in nested for loop

/* Program that uses break in nested for loop */

class BreakDemo2
{
    public static void main(String args[])
    {
        for(int i =0;i<3;i++)
        {
            System.out.print("Iteration "+i+" = ");
            for(int j =0;j<100;j++)
            {
                if(j==10) break;      //terminate loop if j is 10
                System.out.print(j+" ");
            }
            System.out.println();
        }
        System.out.println(" End of outer Loop");
    }
}

Program of adding first ten numbers using the while loop

/* Program of adding first ten numbers using the while loop */

class AddWhile
{
    public static void main(String args[])
    {
        int j = 1 , sum = 0 ;

        while (j<10)
        {
            sum = sum + j ;
            j++ ;
        }

        System.out.println("The sum of first ten numbers is : "+sum);

        while (j<50)
        {
            sum = sum + j ;
            j++ ;
        }

        System.out.println("The sum of first fifty numbers is : "+sum);

        while (j<100)
        {
            sum = sum + j ;
            j++ ;
        }

        System.out.println("The sum of first hundred numbers is : "+sum);
    }
}

Program to demonstrate Access Protection

/* Program to demonstrate Access Protection */

class Demo
{
    int p;            // default access
    public int q;    // public access
    private int r; // private access

    // methods to access r
    void setr(int i)
    {        // set r's value
        r = i;
    }

    int getr()
    {      // get r's value
        System.out.println(" p, q, and r = "+r);
        return r;
    }
}

class AccessProDemo
{
    public static void main(String args[])
    {
        Demo d= new Demo();

        // OK : 'p' and 'q' may be accessed directly
        d.p=300;
        d.q=400;
        //d.r=252;

        // NOT OK : 'r' cannot be accessed outside the class, hence will cause an error
        // d.r=50;
        d.getr();
        // You must access 'r' through its methods
        d.setr(500);        //OK

        System.out.println(" After stting p, q, and r ");
        System.out.println(" p, q, and r = "+d.p+", "+d.q+" and "+d.getr());
    }
}

Program to demonstrate type promotion

/* Program to demonstrate type promotion */

class TypePromotion
{
    public static void main(String args[])
    {
        byte b = 52;
        char c = 'a';
        short s = 1024;
        int i = 50000;
        float f = 7.67f;
        double d = .1234;
        double result = (f*b) + (i/c) - (d*s);

        System.out.println((f*b)+" + "+(i/c)+" - "+(d*s)+" = "+result);

    }
}

Program to demonstrate the ternary Operator

/* Program to demonstrate the ternary Operator */

class Ternary
{

         public static void main(String args[])
    {
            int value1 = 1;
              int value2 = 2;
            int result;
              boolean Condition = true;

            result = Condition ? value1 : value2;

              System.out.println("Result is : "+result);

         }
}

Program to calculate Remainder

/*   Program to calculate Remainder   */

class Remainder
{

    public static void main (String args[])
    {

        int i = 10;
        int j = 3;

        System.out.println("i is : " + i);
            System.out.println("j is : " + j);

        int k = i % j;
        System.out.println("i % j is : " + k);
     }

}

/* Program to compute the area of a circle */

class P15
{
    public static void main(String args[])
    {
        double pi,r,a;

        r=10.8;     //radius of circle
        pi=3.1416;    //pi, approximately
        a = pi*r*r;      //compute area

        System.out.println(" Area of circle is :"+a);
    }
}

Program to demonstrate Relational Operators

/* Program to demonstrate Relational Operators */

class RelationalOp
{
    public static void main(String args[])
    {
        float x = 15.0F, y = 10.65F, z = 25.0F;
        System.out.println("x = "+x);
        System.out.println("y = "+y);
        System.out.println("z = "+z);
        System.out.println("x < y is : "+(x<y));
        System.out.println("x > y is : "+(x>y));
        System.out.println("x == z is : "+(x==z));
        System.out.println("x <= z is : "+(x<=z));
        System.out.println("x >= y is : "+(x>=y));
        System.out.println("y != z is : "+(y!=z));
        System.out.println("y == x+z is : "+(y==x+z));
    }
}

Program to convert given temperature in Fahrenheit to Celsius

/* Program to convert given temperature in Fahrenheit to Celsius */

class P16
{
    public static void main(String args[])
    {
        double celsius1,celsius2,fahrenheit;
        fahrenheit= 40;
        celsius1= (fahrenheit-32)/1.8;
        System.out.print(" Temperature in fahrenheit is "+fahrenheit);
                System.out.println(" is converted to celsius :"+celsius1);
        fahrenheit= 60;
        celsius2= (fahrenheit-32)/1.8;
        System.out.print(" Temperature in fahrenheit is "+fahrenheit);
                System.out.println(" is converted to celsius :"+celsius2);

    }
}

Program to determine salvage value

/* Program to determine salvage value */

class P14
{
    public static void main(String args[])
    {
        double purchase_price, salvage_value,depreciation;
        int years_of_service;

        purchase_price = 250;
        years_of_service = 5;
        depreciation = 30;

        (salvage_value)= -(depreciation*years_of_service-purchase_price);
        System.out.println(" salvage value ="+salvage_value);

    }
}

Program to computes the length of the hypotenuse of a right triangle

/* Program to computes the length of the hypotenuse of a right triangle */

class P12
{
    public static void main(String args[])
    {
        double a = 3.0, b= 4.0;
        double c = Math.sqrt(a*a+b*b);
        System.out.println(" Hypotenuse is :"+c);
    }
}

Program to find absolute value of the variable

/* Program to find absolute value of the variable */

class P11
{
   public static void main(String args[])
   {
       int x = -25, y =-18;

       /* Using Ternary Operator */
       System.out.println("Value of x = "+x);
       x= x<0?-x:x;
       System.out.println("Absolute value of x = "+x);

       /* Using mathematical function 'abs()' */
       System.out.println("\nValue of y = "+y);
       System.out.println("Absolute value of y = "+Math.abs(y));
   }
}

Program to find minimum Number

/* Program to find minimum Number */

class P10
{
     public static void main(String args[])
     {
            int a =3 , b = 7 , c = 0 ;
                int result;
            result = ( a < b ? a : b ) < c ? ( a < b ? a : b ) : c ;
        System.out.println(" The minimum number in "+a+", "+b+","+c+" is "+result);


      }
}

Program to implements the quadratic formula

/* Program to implements the quadratic formula */

class P9
{

    public static void main(String args[])
    {

        //implements the quadratic formula

        double a=2,b=8.001,c=8.002 ;

        System.out.println("a :"+a);
        System.out.println("b :"+b);
        System.out.println("c :"+c);

        System.out.println("\n The equation is : "+a+" * x * x + "+b+" * x + "+c+" = 0 ");

        double d = b * b - 4 * a * c ;
        double sqrtd = Math.sqrt(d);
        double x1 = ( - b + sqrtd) / (2 * a ) ;
        double x2 = ( - b - sqrtd) / (2 * a ) ;

        System.out.println("The Solution are : ");
        System.out.println("\t x1 ="+x1);
        System.out.println("\t x2 ="+x2);

    }
}

Program to exchange the digits of 2-digit number

/* Program to exchange the digits of 2-digit number */

class P8
{
    public static void main(String args[])
    {
        int number= 71, temp, tens;

        System.out.println("\n The Original Number : "+number);

        temp = number % 10;
        tens = 10 * temp;
        temp = number /10;
        number = tens + temp ;

        System.out.println("\n The Exchanged Number : "+number);

    }
}

Program to split of a 4 digit number

/* Program to split of a 4 digit number */

class P7
{
    public static void main(String args[])
    {
        int x = 1234, y, z;

        y = x /1000 ;
        System.out.println(" The digit in the Thousand's place = "+y);

        z = x % 1000;
        y = z /100;
        System.out.println("\n The digit in the Hundred's place = "+y);

        z = z % 100;
        y = z / 10;
        System.out.println("\n The digit in the Ten's place = "+y);

        y = z % 10;
        System.out.println("\n The digit in the Unit's place = "+y);

      }
}

Program to converts inches to centimeters

/* Program to converts inches to centimeters */

class P6
{
    public static void main(String args[])
    {
        float inches = 16.9F, cm ;
        cm = 2.54F * inches ;
        System.out.println(""+inches+" inches = "+ cm +" centimeters");

    }
}

Program to calculate the simple interest

/* Program to calculate the simple interest */

class P5
{
    public static void main(String args[])
    {
        float principle, no_of_years, rate_of_interest, simple_interest;
                principle = 10000;
                no_of_years= 6;
                rate_of_interest = 8.5F;
                simple_interest = principle * no_of_years * rate_of_interest ;
                simple_interest = simple_interest / 100 ;
        System.out.println("\n Simple Interest on a principle of "+principle+" is "+simple_interest+" at the rate of "+rate_of_interest+" for a period of "+no_of_years);

    }
}

Program for computing the volume of a sphere

/* Program for computing the volume of a sphere */

class P4
{
    public static void main(String args[])
    {
        float r=2, volume, pi = 3.14152F;

        volume = (4 * pi * r * r * r) / 3 ;
                System.out.println("Volume : "+volume);
    }
}

Program to interchange the value of the given 2 numbers

/* Program to interchange the value of the given 2 numbers */

class P3
{

    public static void main(String args[])
    {
        int no1=5, no2=18, temp;

        System.out.println("\nBefore interchange Numbers are : ");
        System.out.println("First Number : "+no1);
        System.out.println("Second Number : "+no2);

        temp = no1;
        no1 = no2;
        no2 = temp;

        System.out.println("\nAfter interchange Numbers are : ");
        System.out.println("First Number : "+no1);
        System.out.println("Second Number : "+no2);

    }
}

Program to find Square and cube of a Number

/* Program to find Square and cube of a Number */

class P2
{

     public static void main(String args[])
     {
    int i=5 ;

    System.out.println(" The Number is : "+i) ;
    System.out.println("The Square of Number is : "+(i*i));
    System.out.println("The Cube of Number is : "+(i * i* i));

      }
}

Program to calculate average of 3 numbers

/* Program to calculate average of 3 numbers */

class P1
{
     public static void main(String args[])
     {
             int a, b, c, average;
             a = 3;
         b = 7;
             c = 2 ;
             average = ( a + b + c ) / 3;
             System.out.println(" Average : "+average);
     }
}

Program to demonstrate Mathematical Functions

class P
{
   public static void main(String args[])
   {
       double x= Math.floor(40.6);
       double y = Math.abs(40.6);
       System.out.println(" Value of x is ="+x+" and y is ="+y);

   }
}

Program to demonsrate System.arraycopy() function

/* Program to demonsrate System.arraycopy() function*/

class Arraycopy1
{
    public static void main(String[] args)
    {
            char[] copyFrom = { 'd', 'e', 'c', 'a', 'f', 'f', 'e',
                         'i', 'n', 'a', 't', 'e', 'd' };
            char[] copyTo = new char[7];

            System.arraycopy(copyFrom, 2, copyTo, 0, 7);
            System.out.println(new String(copyTo));
        }
}

Mathematical Applications/Operators/Functions

/* Mathematical Applications/Operators/Functions */

import java.lang.System;
import java.lang.Math;

public class MathApp {
public static void main(String args[]) {
System.out.println(Math.E);
System.out.println(Math.PI);
System.out.println(Math.abs(-1234));
System.out.println(Math.cos(Math.PI/4));
System.out.println(Math.sin(Math.PI/2));
System.out.println(Math.tan(Math.PI/4));
System.out.println(Math.log(1));
System.out.println(Math.exp(Math.PI));
for(int i=0;i<5;++i)
System.out.print(Math.random()+" ");
System.out.println();

}

}

Output:
/*
2.718281828459045
3.141592653589793
1234
0.7071067811865476
1.0
0.9999999999999999
0.0
23.140692632779267
0.11532581519046647 0.4458601351066609 0.980757698093553 0.23030711522893255 0.2
635402093705278
*/

Program to demonstrates the increment operator

/* Program to demonstrates the increment operator*/

class IncDec
{
   public static void main(String args[])
   {
       int a = 10;
       int b = 20;
       int c,d;
       c = ++b;
       d = a++;
       c++;
       System.out.println("a     = "+a);
       System.out.println("b     = "+b);
       System.out.println("c     = "+c);
       System.out.println("d     = "+d);
   }
}

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