bcom3java

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1. Arithmetic Operations

Problem: Write a program to find the Addition, subtraction, multiplication and division using arithmetic operators. Problem solution: Algorithm: 1. Begin 2. Input a, b 3. print ‘addition=’a+b 4. print ‘subtraction=’a-b 5. print ‘multiplication=’a*b 6. print ‘division=’a/b 7. End Program: import java.util.*; class arithmetic {

public static void main(String args[]) {

int a,b;

Scanner in=new Scanner(System.in); System.out.println(“Enter a,b values”); a=in.nextInt(); b=in.nextInt(); System.out.println(“Addition=”+(a+b)); System.out.println(“Subtaction=”+(a-b)); System.out.println(“Multiplication=”+(a*b)); System.out.println(“Division=”+(a/b)); System.out.println(“Modulo Division=”+(a%b)); } } Test data: Enter a,b values 7 5 Addition=12 Subtraction=2 Multiplication=35 Division=2 Modulo divison=2

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2. Bitwise Operations

Problem: Write a program to find the Bitwise AND, OR and XOR operations using bitwise operators.

Problem solution Algorithm:

1. Begin 2. Input a, b

3. print ‘Bitwise AND=’a&b 4. print ‘Bitwise OR=’a|b 5. print ‘Bitwise XOR=’a^b 6. End

Program:

import java.util.*; class bitwise {

int a,b;

Scanner in=new Scanner(System.in); System.out.println(“Enter a,b values”); a=in.nextInt();

b=in.nextInt();

System.out.println(“Bitwise AND=”+(a&b)); System.out.println(“Bitwise OR =”+(a|b)); System.out.println(“Bitwise XOR =”+(a^b)); }

}

Test data Enter a,b values 13

25

Bitwise AND=9 Bitwise OR=29 Bitwise XOR=20

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3. Traingular Stars Problem: Write a program to display stars in triangular form. Problem solution:

Algorithm: 1. Begin

2. print ‘enter how many rows’ 3. input r 4. for i=1 to r 5. print “ “ 6. for j=1 to i 7. print “*” 8. End for 9. End for 10. End Program: import java.util.*; class stars {

int r;

Scanner in=new Scanner(System.in); System.out.println(“Enter how may rows:”); r=in.nextInt();

for(int i=1; i<=r; i++) { System.out.println( ); for(int j=1;j<=i; j++) System.out.print(“*”); } } } Test data

Enter how many rows: 4 *

* * * * * * * * *

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4. Display Color Names

Problem: Write a program to display color name on executing a specific color code. Problem solution

Algorithm: 1 Begin

2 Print “enter color code” 3 Input code 4 If code=’r’ then 5 Print ‘Red’ 6 If code=’b’ then 7 Print ‘Blue’ 8 If code=’g’ then 9 Print ‘Green’ 10 If code=’w’ then 11 Print ‘white’ 12 End if 13 End Program: import java.util.*; class colors {

int code;

Scanner in=new Scanner(System.in); System.out.println(“Enter color code:”); code=(char)System.in.read(); switch(code) { case ‘r’: System.out.println(“Red”); break; case ‘g’: System.out.println(“Green”); break; case ‘b’: System.out.println(“Blue”); break; case ‘w’: System.out.println(“White”); break;

default: System.out.println(“Invalid color”); }

} }

Test data

Enter color code: b Blue

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5. Sorting

Problem: Write a program to sort array elements in ascending order. Problem solution Algorithm: 1. Begin 2. tot=0 3. for i=1 to 5 4. input a[i] 5. End for 6. for i=1 to 5 7. for j=i+1 to 5 8. if a[i]<a[j] then 9. temp=a[i] 10. a[i]=a[j] 11. a[j]=temp 12. end if 13. end for 14. end for

15.print “array elements” 16. for i=1 to 5 17. print a[i] 18. End for 19. End Program: import java.util.*; class sort {

int a[]=new int[5];

Scanner in=new Scanner(System.in);

System.out.println(“Enter Array elements:”); for(int i=0;i<5;i++) a[i]=in.nextInt(); for(int i=0;i<5;i++) { for(int j=i+1;j<5;j++) { if(a[i]<a[j]) { int temp=a[i]; a[i]=a[j]; a[j]=temp; } } }

System.out.println(“Array elements after sort:”); for(int i=0;i<5;i++)

System.out.println(a[i]); }

}

Test data

Enter array elements: 4

2 1 5 3

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6. Net salary Calculation

Problem: Write a program to accept employee basic salary and find net salary. Problem solution:

Algorithm: 1. Begin

2. print “enter employee basic salary” 3. input sal 4. if sal>=7500 then 5. hra=sal*0.12 6. da=sal*0.15 7. ptax=sal*0.05 8. else 9. hra=sal*0.10 10. da=sal*0.12 11. ptax=sal*0.03 12. end if 13. gross=basic+hra+da 14.net=gross-ptax

15. print “gross salary=”gross 16. print “net salary=”net 17. end

Program:

import java.util.*; class netsal {

public static void main(String args[]) throws Exception {

float sal,hra,da,ptax,gs,net;

Scanner in=new Scanner(System.in); System.out.println(“Enter Basic salary:”); sal=in.nextFloat(); if (sal>=7500) { hra=sal*0.12f; da=sal*0.15f; ptax=sal*0.05f; } else { hra=sal*0.10f; da=sal*0.12f; ptax=sal*0.03f; } gs=sal+hra+da; net=gs-ptax; System.out.println(“Gross salary=”+gs); System.out.println(“Net salary=”+net); } } Test data

Enter Basic salary: 6500 Gross salary:

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7. Matrix Addition

Problem: Write a program to find the two-dimensional matrix addition. Problem solution

Algorithm: 1. Begin

2. print “enter first matrix elements” 3. for i=1 to 3

4. for j=1 to 3 5. input a[i][j]

6. print “enter second matrix elements” 7. for i=1 to 3 8. for j=1 to 3 9. input b[i][j] 10. for i=1 to 3 11. for j=1 to 3 12. c[i][j]=a[i][j]+b[i][j]

13. print “result matrix elements 14. for i=1 to 3 15. for j=1 to 3 16. print c[i][j] 17. End Program: import java.util.*; class matadd {

int i,j;

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

System.out.println(“Enter first matrix elements:”); for(i=0;i<3;i++)

{

for(j=0;j<3;j++) a[i][j]=in.nextInt(); }

System.out.println(“Enter second matrix elements:”); for(i=0;i<3;i++) { for(j=0;j<3;j++) b[i][j]=in.nextInt(); } for(i=0;i<3;i++) { for(j=0;j<3;j++) c[i][j]=a[i][j]+b[i][j]; } System.out.println(“result matrix”); for(i=0;i<3;i++) { for(j=0;j<3;j++) System.out.print(“ “+c[i][j]); System.out.println(); } } Test data

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8. Matrix Multiplication

Problem: Write a program to find the two-dimensional matrix addition. Problem solution

Algorithm: 1. Begin

2. print “enter first matrix elements” 3. for i=1 to 3

4. for j=1 to 3 5. input a[i][j]

6. print “enter second matrix elements” 7. for i=1 to 3 8. for j=1 to 3 9. input b[i][j] 10. for i=1 to 3 11. for j=1 to 3 12. c[i][j]=c[i][j]+a[i][k]*b[k][j] 13. print “result matrix elements 14. for i=1 to 3 15. for j=1 to 3 16. print c[i][j] 17. End Program: import java.util.*; class matmul {

public static void main(String args[]) { int i,j;

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

System.out.println(“Enter first matrix elements:”); for(i=0;i<3;i++)

{

for(j=0;j<3;j++) a[i][j]=in.nextInt(); }

System.out.println(“Enter second matrix elements:”); for(i=0;i<3;i++) { for(j=0;j<3;j++) b[i][j]=in.nextInt(); } for(i=0;i<3;i++) { for(j=0;j<3;j++) { c[i][j]=0; for(k=0;k<3;k++) c[i][j]=c[i][j]+a[i][k]*b[k][j]; } } } System.out.println(“result matrix”); for(i=0;i<3;i++) { for(j=0;j<3;j++) System.out.print(“ “+c[i][j]); System.out.println(); } } Test data

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9: Matrix Transpose Problem: Write a program to transpose a two-dimensional matrix. Problem solution:

Algorithm: 1. Begin

2. print “enter matrix elements” 3. for i=1 to 3 4. for j=1 to 3 5. input a[i][j] 6. for i=1 to 3 7. for j=1 to 3 8. b[i][j]=a[j][i]

9. print “Given matrix elements 10. for i=1 to 3

11. for j=1 to 3 12. print a[i][j]

13. print “Tranpose matrix elements 14. for i=1 to 3 15. for j=1 to 3 16. print b[i][j] 17. End Program: import java.util.*; class transpose {

int i,j;

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

System.out.println(“Enter matrix elements:”); for(i=0;i<3;i++) { for(j=0;j<3;j++) a[i][j]=in.nextInt(); } for(i=0;i<3;i++) { for(j=0;j<3;j++) b[i][j]=a[j][i]; }

System.out.println(“Given Matrix elements”); for(i=0;i<3;i++) { for(j=0;j<3;j++) System.out.print(“ “+a[i][j]); System.out.println(); }

System.out.println(“Transpose Matrix elements”); for(i=0;i<3;i++) { for(j=0;j<3;j++) System.out.print(“ “+b[i][j]); System.out.println(); } } } Test data

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10. Strings sorting Problem: Write a program to sort a list of strings.

Problem solution: Algorithm:

1. Begin

2. print “how many names to sort” 3. input n 4. for i=1 to n 5. input name[i] 6. end for 7. for i=1 to n 8. for j=1 to n 9. if name[j]<name[i] then 10. temp=name[j]; 11. a[j]=a[i] 12. a[i]=a[j]; 13. end if

14. print “names after sort” 15. for i=1 to n 16. input name[i] 17. end for 18. end PROGRAM import java.util.*; class stringsort

{ public static void main(String args[]) {

String name[]=new String[10]; String temp;

int i,j,n;

System.out.print("\n How Many names to sort:"); n=in.nextInt(); for(i=0;i<n;i++) { System.out.println("Enter a name:"); name[i]=in.next(); } for(i=0;i<n;i++) { for(j=i+1;j<n;j++) { if(name[j].compareTo(name[i])<0) { temp=name[j]; name[j]=name[i]; name[i]=temp; } } }

System.out.println("\n sorted Names are \n"); for(i=0;i<n;i++)

System.out.println(name[i]); }

}

Test data

How many names to sort: 5 Chennai

Delhi Ahmadabad Culcutta Bombay

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11: String Methods

Problem: Write a program to insert a substring between a string by using string methods. Problem solution:

Algorithm: 1. Begin

2. string s1=”jagans college” 3. m=s1.length() 4. for i=1 to m 5. print s1.CharAat(i) 6. end for 7. int pos=s1.indexof(“c”) 8. s1.insert(pos,”degree”) 9. print s1 10. s1.append(“makes professionsl”,s1) 11. print s1 12. end program: class strmethods {

public static void main(String args[])throws Exception {

StringBuffer S1=new StringBuffer("sv college"); int i;

System.out.println("the original string is:"+S1); int m=S1.length();

System.out.println("length="+m); for(i=0;i<=m;i++)

{

System.out.println("the character at index "+i+" is "+S1.charAt(i)); }

int pos=S1.indexOf("c"); S1.insert(pos,"Degree");

System.out.println("the new string is:"+S1); S1.append("makes proffessionals");

System.out.println("the modified string is"+S1); }

}

Test data

the original string is: sv college the character at index 0 is s the character at index 1 is v the character at index 2 is the character at index 3 is c the character at index 4 is o the character at index 5 is l the character at index 0 is l the character at index 7 is e the character at index 8 is g the character at index 9 is e

the new string is: sv degree college makes proffessional the modified string is: sv degree college makes proffessional

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12. class and objects

Problem: Write a program to create a class student to accept and display student details. Problem solution:

Algorithm Class student

Data: sno,sname,age

Methods: getdata(), putdata() Procedure getdata() 1. begin 2. input sno 3. input sname 4. input age 5. end procedure putdata() 1. begin

2. print “student number”,sno 3. print “Name:”,sname 4. print “Age:”,age 5. end

procedure main() 1. Begin

2. Declare s as student type 3. call s.getdata() 4. call s.putdata() 5. end Program import java.util.*; class student {

Scanner in=new Scanner(System.in); int sno,age;

String sname,course; void getdata()

{

System.out.println("enter student no,name,age and course"); sno=in.nextInt(); sname=in.next(); age=in.nextInt(); course=in.next(); } void putdata() {

System.out.println("Student number : "+sno); System.out.println("Student name: "+sname); System.out.println("Student age: "+age); System.out.println("Course is: "+course); }

}

class studetails {

student s=new student(); s.getdata();

s.putdata(); }

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13. Class Constructor Problem: write a program on implementing constructors. Problem solution: Algorithm class room data: length,breadth constructor: room(x,y) 1. length=x 2. breadth=y room(x) 1. length=breadth=x procedure main() 1. begin 2. declare r1 program import java.util.*; class Room { int l,b; Room(int x,int y) { l=x; b=y; } Room(int x) { l=b=x; } int area() { return(l*b); } }; class rectarea {

Room r1=new Room(4,6); // rectangle object Room r2=new Room(5); // square object

System.out.println(“rectangle room area=”+r1.area()); System.out.println(“square room area=”+r2.area()); }

}

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14. Multiple inheritance Problem: write a program to implement multiple inheritance Problem solution

Algorithm: 1. CLASS student Data: int hno Methods: gethno( ) Puthno( ) getmarks( ) putmarks( ) 2. Interface sports

Final constant: sprotswt=5.5 Abstract method: putwt( )

3. Class Result extends student and implements sports Data: total Method: display( ) 1. total=p1+p2+sportswt 2. puthno( ) 3. putmarks( ) 4. putwt( ) 5. print total 4. procedure main( ) 1. Begin

2. Declare student1 as Result type 3. student1.gethno( ) 4. student1.getmarks( ) 5. student1.display( ) 6. end Program import java.util.*; class student { int hno; void gethno(int a) { hno=a; } void puthno() {

System.out.println("hall ticket no="+hno); } } interface sports { float sportswt=5.5f; void putsportswt(); }

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class test extends student {

float p1,p2;

void getmarks(float x,float y) { p1=x; p2=y; } void putmarks() { System.out.println("part1 marks="+p1); System.out.println("part2 marks="+p2); } }

class results extends test implements sports {

float total;

public void putsportswt() { System.out.println("sportswt="+sportswt); } void display() { total=p1+p2+sportswt; puthno(); putmarks(); putsportswt(); System.out.println("total marks="+total); } } class multiple

{ public static void main(String args[])throws Exception { results student1=new results();

student1.gethno(12536); student1.getmarks(41.5f,27.75f); student1.display(); } } Test data:

Hall ticket no:12356 Part1 marks:41.5 Part2 marks:27.75 Sports wt=5.5 Total marks=

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15: Exception Handling Problem: write a program to implement Exception handling Problem solution

Algorithm: 1. Begin

2. array a[]={2,4,6,8,10} 3. try until exception raise 4. for i=1 to 10

5. print a[i] 6. tot=tot+a[i] 7. end for

8. catch the Exception in e 9. print exception e 10. print tot 11. end program import java.util.*; class excep {

int tot=o;

int a[]={2,4,6,8,10}; try

{

System.out.println("Array elements are"); for(int i=0;i<10;i++) { System.out.println(a[i]); tot=tot+a[i]; } }catch(Exception e1)

{ System.out.println("the exception is:"+e1); } System.out.println("total="+tot); } } Test data Array elements: 2 4 6 8 10

The exception is:AraryIndexOutOfBoundsException total=30

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16. Threads Problem: write a problem to implement threads Problem solution

1.class A extends Thread 1. for i=1 to 10

2. print “ from thread A”,i 3. Print “Exit from threadA” 2.class B extends Thread 1. for j=1 to 10

2. print “ from thread B”,j 3. Print “Exit from thread B” 3.class C extends Thread 1. for k=1 to 10

2. print “ from thread C”, 3. Print “Exit from threadC” 4.procedure main( ) 1. Begin 2. A ThreadA=new A(); 3. B ThreadB=new B(); 4. C ThreadC=new C(); 5. ThreadA.start(); 6. ThreadB.start(); 7. ThreadC.start(); 8. End Program import java.util.*; class A extends Thread

{ int i;

public void run() {

for(i=1;i<=10;i++)

System.out.println("from thread A:"+i); System.out.println("Exit from thread A"); }

}

class B extends Thread

{ int j;

public void run() {

for(j=1;j<=10;j++)

System.out.println("from thread B:"+j); System.out.println("Exit from thread B"); }

}

class C extends Thread

{ int k;

public void run() {

for(k=1;k<=10;k++)

System.out.println("from thread C:"+k); System.out.println("Exit from thread C"); }

}

class Threaddemo {

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System.out.println("Start of main thread"); A ThreadA=new A(); B ThreadB=new B(); C ThreadC=new C(); ThreadA.start(); ThreadB.start(); ThreadC.start(); } } Test data D:\saif>java Threaddemo Start of main thread from thread A:1 from thread A:2 from thread A:3 from thread A:4 from thread B:1 from thread A:5 from thread C:1 from thread A:6 from thread B:2 from thread A:7 from thread C:2 from thread A:8 from thread B:3 from thread A:9 from thread A:10

from thread C:3 from thread C:4 from thread C:5 from thread C:6 from thread B:4 from thread C:7 Exit from thread A from thread C:8 from thread B:5 from thread C:9 from thread B:6 from thread C:10 from thread B:7 Exit from thread C from thread B:8 from thread B:9 from thread B:10 Exit from thread B