Shardayatan (EM) Subject: Computer Studies STD: 12

Transcription

1 Shardayatan (EM) Subject: Computer Studies STD: 12 Chapter 7 (Java Basics) (1) Java Program to compute Call Cost and update prepaid balance amount. public class CallCost double b; double r; double d; double c; b = 170; r = 1.02; d = 37; c=d * r; b= b - c; System.out.print("duration"+d); System.out.print("balance: "+b); (2) Java Program to compute Simple Interest. public class Interest double p; double r; double n; double m; double i; p=1000; r=9.50; n=3; i=n*p*r/100; m=p+i; System.out.println("interest"+ i); System.out.println("Maturity"+ m);

2 (3) Write a Java program to display whether Integer is even or odd. class ifif int x=2; if( x % 2 == 0) System.out.println("even"); else System.out.println("odd"); (4) Write a Java program to display whether student is pass or fail. class IfElse int marks, pm; pm = 40; marks=35; System.out.println("marks=40 "); if (marks >= pm) System.out.println("Pass"); else System.out.println("Fail"); (5) Write a Java program to display the grade based on percentage of marks using switch statement. public class Grade int choice=0; int marks=200; if(marks > 499) choice=1; else if(marks>400)

3 choice=2; else if(marks>300) choice=3; switch(choice) case 1: System.out.println("Your Grade is A+"); break; case 2: System.out.println("Your Grade is B+"); break; case 3: System.out.println("Your Grade is C+"); break; default: System.out.println("Your Grade is D"); (6) Write a Java Program using Nested Class. class Nested int age = 29; if (age < 13) System.out.println("child!"); else if (age < 19) System.out.println("teenager."); else if (age < 65) System.out.println("adult!"); else System.out.println("senior");

4 (7) Write a program that determines the price of a movie ticket based on customer s age and the time of the show (normal or matinee). The normal show and matinee show ticket price for adult is Rs. 100 and Rs. 50 respectively. Adults are those over 13 years. The children s ticket price is Rs. 60 and Rs. 40 for normal show and matinee show respectively. Declare variables of suitable data types for age and show time, assign the values to these variables and print age, show time and the ticket price. class Ticket int age=15; int ticket=0; float showtime=10; if((age>=13)) if((showtime>=10)) ticket=100; else ticket=50; else if((age<13)) if((showtime>=10)) ticket=60; else ticket=40; System.out.println("Customer Age:"+ age); System.out.println("Show Time:" + showtime); System.out.println("Ticket:"+ ticket); (8) During a sale at a store, a 10% discount is applied to purchases over Rs Write a program that assigns any value to variable purchase and then calculates the discounted price. Display purchase amount and discount offered. public class valtar double p=5000; double v; double r=10; double np=0;

5 if(p>=5000) v=5000*0.10; np=p-v; System.out.println("purchase " + p); System.out.println("Net Purchase" + np); Chapter 8 (Classes and Objects in JAVA) (1) Write a Java Program to display length, width, height, No of windows of Room using two classes. class R float length, width, height; byte nwindows; void setattr(float l, float w, float h, byte n) length=l; width=w; height=h; nwindows=n; double area() return(length*width); void display() System.out.println("\n Length:" + length); System.out.println("\n Width:" + width); System.out.println("\n Height:" + height); System.out.println("\n Number of Windows:" + nwindows); class RoomDemo public static void main(string args[ ]) R r1; r1=new R(); R r2=new R(); r1.display(); r2.display(); r1.setattr(18,12.5f, 10,(byte)2); r2.setattr(14,11,10, (byte)1); r1.display(); r2.display();

6 System.out.println("\n Area of room with length" + r1.length + "width" + r1.width + "is"+ r1.area()); System.out.println("\n Area of room with length" + r2.length + "width" + r2.width + "is"+ r2.area()); (2) Write a Java program to display polymorphism: method printline. class PrintLine static void printline() for(int i=0; i<40; i++) System.out.print('='); System.out.println(); static void printline(int n) for(int i=0; i<n; i++) System.out.print('#'); System.out.println(); static void printline(char ch, int n) for(int i=0; i<n; i++) System.out.print(ch); System.out.println(); public class polydemo public static void main(string[] s) PrintLine.printline(); PrintLine.printline(30); PrintLine.printline('+', 20); Chapter 9 (Working with Array and String) (1) Array object with its elements initialized by default values. class Array1 public static void main(string[] s) int marks[]; marks=new int[30]; for(int i=0; i<30; i++) //storing values in an array marks[i]=i; for(int i=0; i<30; i++) // retrieving values from the array

7 System.out.println("marks ["+i+"] is " + marks[i]); (2) Different ways to create and initialize array object class array2 public static void main(string[] s) int marks1[]; marks1=new int[3]; int marks2[]=new int[3]; int[] marks3=new int[3]; int marks4[]=50,60,70; int[] marks5=70,80,90; System.out.print("Array mark1:\t"); display(marks1,3); System.out.print("Array mark2:\t"); display(marks2,3); System.out.print("Array mark3:\t"); display(marks3,3); System.out.print("Array mark4:\t"); display(marks4,3); System.out.print("Array mark5:\t"); display(marks5,3); static void display(int arr[], int size) for(int i=0; i<size; i++) System.out.print(arr[i] + "\t"); System.out.println(); (3) 2-D array : characters stored in bytes using corresponding integer value. class Array2Dbyte public static void main(string[] s) byte name[] [] = 'J','a','v','a', 'C', 'C','+','+', 'B','a','c','i','c', 'P','a','s','c','a','i', ; System.out.print("Fives names stored in 2-D array of characters : \n"); display(name, 5);

8 static void display(byte arr[][], int rows) for (int i=0; i<rows; i++) for(int j=0; j<arr[i].length; j++) System.out.print(arr[i] [j] + "\t"); System.out.println(); (4) Program using 2-D array with variable number of columns. class Array2Dchar public static void main(string[] s) char name[][]= 'J','a','v','a', 'C', 'C','+','+', 'B','a','c','i','c', 'P','a','s','c','a','i', ; System.out.println("Number of elements in 2-D array:" + name.length + "\n"); System.out.println("Five names stored in 2-D Array of characters:\n"); display(name, 5); static void display(char arr[][], int rows) for(int i=0; i<rows; i++) System.out.print("Row " + i + " have" + arr[i].length+"character elements:"); for(int j=0; j<arr[i].length; j++) System.out.print( arr[i][j]); System.out.println(); (5) Program to Compute average of 10 numbers using 1-D Array and loop. class ArrayAvg public static void main(string[] s) double numbers[]=10.5,20.6,30.8,15.5,17.3,25.5,27.2,20,30,18.5; byte ctr;

9 double sum=0, avg; System.out.println("list of number is"); for(ctr=0; ctr<10; ctr++) System.out.println(numbers[ctr]); sum=sum+numbers[ctr]; avg=sum/10; System.out.println("\n Average of above number is" + avg); Chapter 10 (Exception Handling in JAVA) (1) Program to display the content of element of citylist array that does not exist.(try...catch) import java.lang.string; class TryCatchDemo public static void main(string args[]) String citylist[] = "Ahmedabad","Baroda","Rajkot","Surat"; System.out.println("Statement to be executed before "); System.out.println("Statement to be executed within block, before displaying the fifth element."); System.out.println(citylist[5]); System.out.println("Statement to be executed within block, before displaying the fifth element."); catch(arrayindexoutofboundsexception eobj) System.out.println("Within Catch Block"); System.out.println("Caught Exception object of type :" + eobj); finally System.out.println("Statement to be executed compulsorily"); System.out.println("Statement to be executed after... catch"); (1) Reading from a file using character stream. import java.io.*; class FileRead public static void main(string args[]) Chapter 11 (File Handling)

10 FileReader frobject = null; frobject = new FileReader("Charfile1.txt"); int i; char ch; while((i = frobject.read())!= -1) ch=(char) i; System.out.print(ch); System.out.print("\n"); catch(exception eobj) System.out.println(eobj); finally frobject.close(); catch(exception eobj) System.out.println(eobj); (2) Write to a file using character stream. import java.io.*; class FileWrite public static void main(string args []) FileWriter fwobject = null; //create an object of FileWrite fwobject = new FileWriter("Charfile1.txt"); //write strings to the file fwobject.write("start writing in file..."); for(int i=1; i<11; i++) fwobject.write("\nline : " + i); fwobject.write("end of writing file...");

11 catch(exception eobj) System.out.println(eobj); finally fwobject.close(); catch(exception eobj) System.out.println(eobj); (3) Write a java program to add two numbers taken as input from the user. import java.io.*; import java.util.*; class ScannerInput public static void main(string args[]) Scanner kbinput = null; int num1; int num2; int sum=0; kbinput = new Scanner(System.in); System.out.println("\nEnter first number : "); num1 = kbinput.nextint(); System.out.println("\nEnter second number : "); num2 = kbinput.nextint(); sum = num1 + num2; System.out.println("\nSum is : " + sum); catch(exception eobj) System.out.println(eobj); finally kbinput.close();

12 catch(exception eobj) System.out.println(eobj);