Q1) Write a program to calculate the area of a circle showing the declaration of variables and

methods.

import java.util.*;

public class circle

// instance variables - replace the example below with your own

private int r;

public void setRadius(int r)

this.r=r;

public double area()

return 3.14*r*r;

public static void main(String args[])

int r;

double a;

Scanner sc=new Scanner(System.in);

System.out.println("Enter Radius");

r=sc.nextInt();

circle c=new circle();

c.setRadius(r);

a=c.area();

System.out.println("Area of Circle :"+a);

}
}

Q2) Write a program to accept a two digit number.Add the sum of its digit to the product of digits.If
the value is equal print the message”special digit” otherwise print”not a special digit.

import java.util.*;

public class sumproduct

public static void main(String args[])

Scanner sc=new Scanner(System.in);

int num,a,s=0,p=1,k,onum;

System.out.println("Enter two digit number:");

num=sc.nextInt();

onum=num;

while(num!=0)

a=num%10;

s=s+a;

p*=a;

num/=10;

System.out.println ("Sum of digits :"+s);

System.out.println("product of digits :"+p);

k=s+p;

if(k==onum)

System.out.println("special number");

else
 System.out.println("Not a special Number");

Q3) Design a class to overload a function area() as follows:

public class mansu

// instance variables - replace the example below with your own

double area(double a,double b,double c)

double s=(a+b+c)/2;

return Math.sqrt(s*(s-a)*(s-b)*(s-c));

double area(int a,int b,int height)

return (height*(a+b))/2;

public static void main(String ap[])

mansu m=new mansu();

System.out.println("Area of Tringle :"+m.area(5.3,4.5,3.2));

System.out.println("Area of Trapisum :"+m.area(5,4,10));

}
Q4) Define a class Telephone having the following description:

import java.util.*;

public class Telephone

// instance variables - replace the example below with your own

private int prv,pre,calls;

private String name;

private double amt,total;

/**

* Constructor for objects of class Telephone

*/

public Telephone()

// initialise instance variables

public void input()

Scanner sc=new Scanner(System.in);

System.out.println("Enter Previous Reading ");

prv=sc.nextInt();

System.out.println("Enter Current Reading ");

pre=sc.nextInt();

System.out.println("name of customer :");

name=sc.next();
}

void call()

calls=pre-prv;

if(calls<=100)

amt=0;

else if(calls>100 && calls<=200)

amt=(calls-100)*90;

else if(calls>200 && calls<=400)

amt=(calls-200)*80+(100*90);

else if (calls>400)

{ amt=(calls-400)*70+(200)*80+(100*90);

amt=amt/100;

total=180+amt;

void display()

{ call();

System.out.println ("Name\t\t Calls made\t\tAmount\t\tTotal Amount");

System.out.println(name+"\t\t"+calls+"\t\t"+amt+"\t\t"+total);

/**

* An example of a method - replace this comment with your own

* @param y a sample parameter for a method

* @return the sum of x and y

*/

public static void main(String args[])

{
 Telephone t=new Telephone();

t.input();

t.display();

Q5) Write a program in java to input a word.Arrange all the alphabets of the word in ascending
order and display the new word.

public class alphabets

public static void main(String ap[])

Scanner sc=new Scanner(System.in);

String n;

String n1="";

System.out.println("Enter any string");

n=sc.next();

char c;

char cha[]=n.toCharArray();

for(int i=0;i<cha.length;i++)

for( int j=i+1;j<cha.length;j++)

if(cha[i]>cha[j])

c=cha[i];

cha[i]=cha[j];

cha[j]=c;

}
 }

for(int i=0;i<cha.length;i++)

n1+=cha[i];

// System.out.println(cha[i]);

System.out.println(n1);

Q6) Write a program in Java to accept an integer arrays from the user and sort the array Bubble sort
technique.

import java.util.*;

public class sortarray

public static void main(String args[])

int a[]=new int[10];

int n;

int i,j,t;

Scanner sc=new Scanner(System.in);

System.out.println("Enter how many Numbers in an array :");

n=sc.nextInt();

for(i=0;i<n;i++)

System.out.println("Enter Array Elements");

a[i]=sc.nextInt();
 }

for ( i=0;i<n;i++)

for(j=0;j<n-1-i;j++)

if(a[j]>a[j+1])

t=a[j];

a[j]=a[j+1];

a[j+1]=t;

for(i=0;i<n;i++)

System.out.print(a[i]+" ");

Q7) Using scanner class….. end with a small letter.

import java.util.*;

public class printword

public static void main(String args[])

Scanner sc=new Scanner(System.in);

String n,n2="";

System.out.println("Enter any string ");

int k=0;

for(int i=0;i<n.length();i++)

//System.out.println(n.charAt(i));

if(n.charAt(i)==' ')

if(Character.isLowerCase(n.charAt(i-1)) && Character.isUpperCase(n.charAt(k)))

n2+=n.substring(k,i)+" ";

k=i+1;

if(Character.isUpperCase(n.charAt(k)) && Character.isLowerCase(n.charAt(n.length()-1)))

n2+=n.substring(n.lastIndexOf(' ')+1,n.length());

System.out.println(n2);

Q8) Write a program….. prime or not.

// instance variables - replace the example below with your own

int cal_hcf(int n1,int n2)

{ int n,d,e;

if(n2>n1)

n=n2;

d=n1;

else

n=n1;

d=n2;

while(d>0)

e=n%d;

n=d;

d=e;

return n;

int prime(int n)

{ int i;

for(i=2;i<n;i++)

{ if(n%i==0)

break;

}
 if(i==n)

return 1;

else

return 0;

public static void main(String args[])

coprime a=new coprime();

//System.out.println("hcf:"+a.cal_hcf(17,3));

int n1,n2;

Scanner sc=new Scanner(System.in);

System.out.println("Enter 1st Number :");

n1=sc.nextInt();

System.out.println("Enter 2nd Number :");

n2=sc.nextInt();

if(a.prime(n1)==1 && a.prime(n2)==1 && a.cal_hcf(n2,n1)==1)

System.out.println("Number is co-prime ");

else

System.out.println("Not a co-prime number ");

}
Q9) Write a program…. Searched word.

import java.util.*;

public class findword

public static void main(String args[])

Scanner sc=new Scanner(System.in);

System.out.println("Enter Sentence:");

String str=sc.nextLine();

System.out.println("Enter word to Search :");

String word=sc.nextLine();

int l=word.length();

int p=str.length();

int k=0,count=0;

String chk="";

for(int i=0;i<p;i++)

if(str.charAt(i)!=' ')

chk=chk+str.charAt(i);

//chk=str.substring(k,i-1);

// System.out.println(chk);

else if(str.charAt(i)==' ')

if(chk.equals(word))

{ System.out.println(chk);
 count++;

chk="";

System.out.println("Word Occur :"+count + " times");

Q 10) Write a program… separate line.

import java.util.*;

public class upper

public static void main(String args[])

Scanner sc=new Scanner(System.in);

System.out.println("Enter Sentence:");

String str=sc.nextLine();

int p=str.length();

int k=0,count=0;

String chk="";

for(int i=0;i<p;i++)

{
 if(str.charAt(i)!=' ')

chk=chk+str.charAt(i);

else if(str.charAt(i)==' ')

System.out.println(chk.toUpperCase());

chk="";

System.out.println(chk.toUpperCase());

Q 11) Sum of series…

import java.util.*;

public class series

public static void main(String ap[])

int p=2;

int x,s=0;

Scanner sc=new Scanner(System.in);

System.out.println("Enter value for x:");

x=sc.nextInt();

for(int i=p;i<=20;i+=3)

{ System.out.print(x+":"+i+" ");

s+=Math.pow(x,i);

System.out.println("sum is :"+s);

Q12) Print the series..

import java.util.*;

public class series2

// instance variables - replace the example below with your own

public static void main(String args[])

int s=0,i=2,s1=0,k,n;

Scanner sc=new Scanner(System.in);

System.out.println("enter value for n :");

n=sc.nextInt();

for(i=2;i<=n;i++)

s=s+i;

k=11+s;

s1=s1+k;
 }

System.out.println("sum is "+s1);

Q13) Write a program.. pattern.

public class pattern

public static void main(String args[])

for(int i=1;i<=5;i++)

for(int j=5;j>=i;j--)

System.out.print(j+" ");

System.out.println();

Q14) Define a class taximeter..

import java.util.*;

public class taximeter

int taxino;

String passengerName;

int km;
public taximeter()

taxino=0;

passengerName="";

km=0;

void input()

Scanner sc=new Scanner(System.in);

System.out.println("Enter taxi Number :");

taxino=sc.nextInt();

System.out.println("Enter Passenger Name :");

passengerName=sc.next();

System.out.println("Enter Kilometer travel :");

km=sc.nextInt();

int calculate()

if(km<=1)

return 25;

else if(km>1 && km<=6)

return 25+(km-1)*10;

else if(km>6 && km<=12)

return 25+(km-6)*15+5*10;

else if(km>12 && km<=20)

return 25+(km-12)*20+(6*12)+(5*10);

else

return 25+(km-20)*25+(8*20)+(6*12)+(5*10);

}
 void display()

{ int r=calculate();

System.out.println("Taxi Number\t Name \t\t Kilometer Travel \t\t+Bill Amount");

System.out.println(taxino+"\t"+passengerName+"\t\t"+km+"\t\t"+r);

// instance variables - replace the example below with your own

public static void main(String ap[])

taximeter t=new taximeter();

t.input();

t.display();

Q15) Write a menu… 1 or 2.

import java.util.*;

public class menudriven

// instance variables - replace the example below with your own

public static void main(String args[])

int ch;

do

Scanner sc=new Scanner(System.in);

System.out.println("1 Series 1");

System.out.println("2 Series 2");

System.out.println("Enter Your choice");

ch=sc.nextInt();
switch(ch)

case 1:

int n;

double s=0;

System.out.println("Enter Limit for Series:");

n=sc.nextInt();

for(int i=4;i<=n;i+=4)

s+=1/(double)i;

System.out.println("sum of first Series :'"+s);

break;

case 2:

int n1,f=1;

double s1=0;

System.out.println("Enter Limit for Series:");

n1=sc.nextInt();

for(int i=1;i<=n1;i++)

f=f*i;

if(i%2!=0)

s1+=1/(double)f;

else

s1-=1/(double)f;

}
 System.out.println("sum of first Series :'"+s1);

break;

default:

System.out.println("Wrong Choice");

break;

} while(ch<=3);

Q16) Write a program.. full stop.

import java.util.*;

public class capital

public static void main(String ap[])

Scanner sc=new Scanner(System.in);

System.out.println("Enter any String :");

String s=sc.nextLine();

int l=s.length();

String s1="";

char c=s.charAt(0);

s1+=c;

for(int i=0;i<l;i++)

if(s.charAt(i)==' ')

s1+=".";
 c=s.charAt(i+1);

s1+=c;

System.out.println(s1.toUpperCase());

Q17)

import java.util.*;

public class options

public static void main(String ap[])

Scanner sc=new Scanner(System.in);

int ch;

System.out.println("1 Print Total digits in a string");

System.out.println("2 Count number of white spaces in a string");

System.out.println("3 Count Upper case Letter in a String");

System.out.println("Enter Your Choice :");

ch=sc.nextInt();

switch(ch)

case 1:

int dcount=0;

String dstring="";

System.out.println("Enter any String");

dstring=sc.nextLine();

for(int i=0;i<dstring.length();i++)

if(Character.isDigit(dstring.charAt(i)))

dcount++;

System.out.println("total Number of digits :"+dcount);

break;

case 2:

int scount=0;

System.out.println("Enter any String");

sc=new Scanner(System.in);

String sstring=sc.nextLine();

for(int i=0;i<sstring.length();i++)

if(sstring.charAt(i)==' ')

scount++;

System.out.println("total Number of spaces :"+scount);

break;

case 3:

int ucount=0;

System.out.println("Enter any String");

sc=new Scanner(System.in);

String ustring=sc.nextLine();
 //sc.next();

for(int i=0;i<ustring.length();i++)

if(Character.isUpperCase(ustring.charAt(i)))

ucount++;

System.out.println("total Number of Uppercase Digits :"+ucount);

Q18) Java program to find transpose of a matrix.

public class transpose

// instance variables - replace the example below with your own

public static void main(String ap[])

int a[][]={{1,2,3},

{4,5,6},

{7,8,9}};

int b[][]=new int[3][3];

int i,j;

for(i=0;i<3;i++)
 {

for(j=0;j<3;j++)

b[i][j]=a[j][i];

for(i=0;i<3;i++)

for(j=0;j<3;j++)

System.out.print(b[i][j]+"\t");

System.out.println();

Q19) Write a program… reverse sentence.

import java.util.*;

public class reverse

// instance variables - replace the example below with your own

public static void main(String args[])

String str;

Scanner sc=new Scanner(System.in);

System.out.println("Enter any String :");

str=sc.nextLine();
 String word[]=str.split(" ");

String str2=" ";

for(int i=0;i<word.length;i++)

str2=word[i]+' '+str2;

//System.out.println(word[i]);

System.out.println(str2);

Q20) Switch case pattern..

import java.util.*;

public class testpattern

public static void main(String ap[])

int ch;

Scanner sc=new Scanner(System.in);

System.out.println("1 for First Pattern");

System.out.println("2 for Second Pattern");

System.out.println("Enter Your Choice:");

ch=sc.nextInt();

switch(ch)

case 1:

for(int i=1;i<=4;i++)

{
 for(int j=1;j<=i;j++)

System.out.print(j);}

System.out.println();

break;

case 2:

for(int i=1;i<=4;i++)

for(int j=4;j>=i;j--)

System.out.print(j);}

System.out.println();

break;

case 3:

System.out.println("Wrong choice");