W2 COMPUTER PROGRAMMINING 2020 SPRING

 

 CLASS EXERCISES

Class exercises will be completed and graded in class

Eksersiz programları yazılacak ve çalıştırılacak, sınıf hocasına gösterilecektir.

 

W2EX1

 import javax.swing.JOptionPane;

class W2Ex1

{

public static void main(String arg[])

{ String s=JOptionPane.showInputDialog("x=");

  double x=Double.parseDouble(s);

  double y=3.1*x*x-1.23*x+13.8;

  String w="x = "+x+" y = "+y;

  System.out.println(w);}

}

W2Ex1A

import javax.swing.JOptionPane;

class W2Ex1A

{

public static double f(double x)

{double y=3.1*x*x-1.23*x+13.8;

 return y;

}

public static void main(String arg[])

{ String s=JOptionPane.showInputDialog("x = ");

  double x=Double.parseDouble(s);

  String w="x = "+x+" y = "+f(x);

  JOptionPane.showMessageDialog(null,w);}

}

W2Ex1B

 import javax.swing.JOptionPane;

class W2Ex1B

{

public static double f(double x)

{double y=3.1*x*x-1.23*x+13.8;

 return y;

}

public static double readD(String s)

{String z=JOptionPane.showInputDialog(s);

  double x1=Double.parseDouble(z);

  return x1;

}

public static void print(String w)

{JOptionPane.showMessageDialog(null,w);}

public static void main(String arg[])

{ double x=readD("x = ");

  String s="x = "+x+" y = "+f(x);

  print(s);

}

}

W2Ex1C

import javax.swing.JOptionPane;

class W2Ex1C

{

public static double f(double x)

{double y=3.1*x*x-1.23*x+13.8;

 return y;

}

 

public static void main(String arg[])

{ double x=W2Ex1B.readD("x = ");

  String s="x = "+x+" y = "+f(x);

  W2Ex1B.print(s);

}}

W2Ex1D

 import java.util.Scanner;

class W2Ex1D

{

public static void main(String arg[])

{ Scanner input = new Scanner( System.in );

  System.out.print("x=");

  String s=input.next();

  double x=Double.parseDouble(s);

  double y=3.1*x*x-1.23*x+13.8;

  String w="x = "+x+" y = "+y;

  System.out.println(w);}

}

 

Character (char) variable type define actual characters in computers. In order to see characters in java ISO Unicode character standards are used. Unicode character code consist of 4 hexagonal (base 16) number. In case you are not familiar with orthogonal number system, a table of equiavalancy is given

Tablo 2.2.1 Heksagonal(sixteen base), and 10 base and binary number systems equvalency

Heksagonal

10 base

2 base (binary)

0

0

0000

1

1

0001

2

2

0010

3

3

0011

4

4

0100

5

5

0101

6

6

0110

7

7

0111

8

8

1000

9

9

1001

A

10

1010

B

11

1011

C

12

1100

D

13

1101

E

14

1110

F

15

1111

 

in ISO unicode '\u0041' defines character 'A'. or '\u03E1'. Or code '\u03E1'  defines 'a'. When the first two number of unicode equals to 0, it defines ASCII characte codes. You can find very detailed list of characters in ISO unicode by looking the internet site  http:\\unicode.org

 

W2Ex2       character variables

 import javax.swing.*;

public class W2Ex2

{   public static void main(String args[])

    { char b1,b2,b3,b4,b5,b6;

      b1='ü';

      b2='ğ';

      b3='ç';

      b4='a';

      b5='b';

      b6='c';

      String s=""+b1+b2+b3+b4+b5+b6;

      JOptionPane.showMessageDialog(null,s," character procesing",JOptionPane.PLAIN_MESSAGE);

       }

 }

 

W2Ex2A

 import javax.swing.*;

public class W2Ex2A

{   public static void print(String s)

   {JOptionPane.showMessageDialog(null,s," character procesing",JOptionPane.PLAIN_MESSAGE);}

    public static void main(String args[])

    { char b1,b2,b3,b4,b5,b6;

      b1='\u00FC';

      b2='\u01E7';

      b3='\u00E7';

      b4='\u0061';

      b5='\u0062';

      b6='\u0063';

      String s=""+b1+b2+b3+b4+b5+b6;

      print(s);

    }

 }

 

W2Ex2B

 public class W2Ex2B

{   public static void main(String args[])

    { char b1,b2,b3;

        b1='\u03B1'; // alfa

        b2='\u03B2'; // beta

        b3='\u03B3'; // gamma

        String s="alfa = "+b1+" beta="+b2+" gamma="+b3;

        W2Ex2A.print(s);

    }

 }

 

W2Ex2C

public class W2Ex2C

{ // characters

 public static void main(String arg[])

 { char b1,b2;

 b1='\u0394'; //big delta

 b2='\u00B2'; //Square sign

 String s=""+b1+"T ="+b1+"x"+b2+" + "+b1+"y"+b2;

 W2Ex2A.print(s);

 }}

 

 

Boolean type variable is for logical processes. Key word for the boolean type variable is boolean. Boolean variable is only one bit long and taken value true or false

boolean  x=true;

boolean y=false;

The available operators for the boolean variables are:

Table 3.1.1 Boolean operators that operate directly in boolean variables

Boolean operator

Meaning

&&

and

||

or

!

not

 

Table 3.1.3 Boolean operators that operates on integer and real variables variables

Boolean operator

Meaning

> 

Grater than

< 

Smaller than

==

Equal to

>=

Greater than and equal to

<=

Smaller than and equal to

!=

Not equal to

 

W2Ex3 Boolean variables

 import javax.swing.*;

public class W2Ex3

{ //boolean variables

public static void print(String s)

{JOptionPane.showMessageDialog(null,s,"W2Ex3 Boolean variables",JOptionPane.PLAIN_MESSAGE);}

 public static void main(String arg[])

 { boolean b1=true;

boolean b2=false;

boolean b3=b1&&b2;

boolean b4=b1||b2;

boolean b5=!b1;

String s="b1="+b1+"\n";

s+="b2="+b2+"\n";

s+="b3="+b3+"\n";

s+="b4="+b4+"\n";

s+="b5="+b5+"\n";

print(s);

 }

}

W2Ex3A

 import javax.swing.*;

public class W2Ex3A

{ //boolean variables

public static int readI(String s)

{   String w=JOptionPane.showInputDialog(s);

            int x=Integer.parseInt(w);

            return x;

}

public static void main(String arg[])

{

int x=readI("x = ");

int y=readI("y = ");

boolean b1=x>y;

boolean b2=x<y;

boolean b3=(x==y);

boolean b4=(x!=y);

boolean b5=!(x==y);

boolean b6=(x==y) && (x!=y);

boolean b7=b3 && b4;

String s="b1="+b1+"\n";

s+="b2="+b2+"\n";

s+="b3="+b3+"\n";

s+="b4="+b4+"\n";

s+="b5="+b5+"\n";

s+="b6="+b6+"\n";

s+="b7="+b7+"\n";

W2Ex3.print(s);

}}

 

W2Ex4 If statement

 import javax.swing.*;

public class W2Ex4

{ //If statement

 

public static void print(String s)

{JOptionPane.showMessageDialog(null,s,"W2Ex4 If statement",JOptionPane.PLAIN_MESSAGE);}

 

public static String read(String s)

{String w=JOptionPane.showInputDialog(s);return w;}

 

public static void main(String arg[])

{String x=read("enter your name");

 String t="Turhan";

 boolean b1=x.equals(t);

 String s="";

 if(b1) {s="your name is "+t;}

 else {s="your name is not "+t;}

 print(s);

 }}

W2Ex4A.java

 import java.io.*;

import javax.swing.JOptionPane;

class W2Ex4A

{

public static double readD(String s)

{String w=JOptionPane.showInputDialog(s);double d=Double.parseDouble(w);return d;}

public static void main(String args[])

{

double x;

double y;

x=readD(" x = ");

y=readD(" y = ");

if(x<y)

{ W2Ex4.print(x+" is smaller than "+y);}

else if(x>y)

{ W2Ex4.print(x+" is bigger than "+y);}

 else if(x==y)

{ W2Ex4.print(x+" is equal to "+y);}

}

}

W2Ex4B

 import java.io.*;

import javax.swing.JOptionPane;

class W2Ex4B

{

public static double readD(String s)

{String w=JOptionPane.showInputDialog(s);double d=Double.parseDouble(w);return d;}

public static void main(String args[])

{

//Guess the color

String s1;

String s=W2Ex4.read(" Enter a color = ");

boolean b1=s.equals("red");

if(b1) {s1=" Correct guess color you enter is red";}

else   {s1=" color you enter is not red, it is "+s;}

W2Ex4.print(s1);

}

}

W2Ex4C

 class W2Ex4C

{

public static void main(String args[])

{

double x;

double y=0;

x=W2Ex4A.readD(" x = ");

if(x<3)

{ y=3.0*x+3;;}

else if(x>=3 && x<5)

{ y=12+(x-3)*(x-3);}

else

{ y=16.0+2.0*x*x-5.0;;}

W2Ex4.print("x = "+x+"\ny = "+y);

}}

W2Ex4D

 class W2Ex4D

{

public static double f(double x)

{double y=0;

if(x<3)

{ y=3.0*x+3;;}

else if(x>=3 && x<5)

{ y=12+(x-3)*(x-3);}

else

{ y=16.0+2.0*x*x-5.0;;}

return y;

}

public static void main(String args[])

{

double x;

x=W2Ex4A.readD(" x = ");

double y=f(x);

W2Ex4.print("x = "+x+" y = "+y);

}}

 

W2Ex4E

class W2Ex4E

{

public static String f(double x,double y)

{ String s="";

if(x>5 && y>5) { s="x and y are greater than 5.";}

else if(x>5 && y==5) { s="x and y are greater than 5.";}

else if(x>5 && y<5) { s="x is greater than 5 and y is smaller than 5";}

else if(x<=5 && y>5) { s="x is smaller or equal to five  y is greater than 5.";}

else if(x<=5 && y==5) { s="x is greater than 5  and y is equal to 5";}

else if(x <= 5 && y<5) { s="x is smaller or equal to five  y is smaller than 5."; }

return s;

}

public static void main(String args[])

{

double x,y;

x=W2Ex4A.readD(" x = ");

y=W2Ex4A.readD(" y = ");

W2Ex4.print(f(x,y));

}}

 

HOMEWORK EXERCISES

Homework exercises will be done at home and will bring to next tuesday class printed no late exercises will be excepted. Each code should include student name id#, code plus results should be given. Homeworks will be accepted in written format only

 

W2HW1

By using Unicode characters write

Into graphic screen by using JOptionPane.showMessageDialog method

 

W2HW2  (if statement )

Function is given write a method public static double y(double x) to calculate the value see program W2Ex4C, W2Ex4E

 

W1HW3

Enter a name from the screen as input

and if name is equal to “ali” or “veli” or “deli” write “you are not welcome to java”+name as output

and if not write “welcome to java”+name  

Example: Welcome to java Turhan

 

Summary of Java Statements

Console Input

Scanner input = new Scanner(System.in);

int intValue = input.nextInt();

long longValue = input.nextLong();

double doubleValue = input.nextDouble();

float floatValue = input.nextFloat();

String string = input.next();

Console Output

System.out.println(anyValue);

GUI Input Dialog

String string = JOptionPane.showInputDialog(

"Enter input");

int intValue = Integer.parseInt(string);

double doubleValue =

Double.parseDouble(string);

Message Dialog

JOptionPane.showMessageDialog(null,

"Enter input");

 

Primitive Data Types

byte 8 bits (from -128 to 127)

short 16 bits (From -32768 to 32767)

int 32 bits (From -2157483648 to 2147483647)

long 64 bits (From -9223372036854775808 to  9223372036854775808)

float 32 bits  (From -3.40292347e+38 to 3.40292347e+38)

double 64 bits (From 1.7976931348623157e+308 to 
1.7976931348623157e+308)

char 16 bits  (Unicode)

boolean 1 bit (true/false)

Arithmetic Operators

+ addition

- subtraction

* multiplication

/ division

% remainder

++var preincrement

--var predecrement

var++ postincrement

var-- postdecrement

Assignment Operators

= assignment

+= addition assignment

-= subtraction assignment

*= multiplication assignment

/= division assignment

%= remainder assignment

Relational Operators

< less than

<= less than or equal to

> greater than

>= greater than or equal to

== equal to

!= not equal

Logical Operators

&& short circuit AND

|| short circuit OR

! NOT

^ exclusive OR

if (condition1) {statements;}

else if (condition2) {statements;}

else if (condition3) {statements;}

………

else {statements;}

 

switch Statements

switch (intExpression) {

case value1:

statements;

break;

...

case valuen:

statements;

break;

default:

statements;

}

While and do-while loop Statements

 

while (condition) {

statements;

}

 

 

do {

statements;

} while (condition);

For loop statements

 

for (init; condition;adjustment)

{

statements;

}

 

Frequently Used Static Constants/Methods

 

Math.PI

Math.exp()

Math.random()

Math.pow(a, b)

System.currentTimeMillis()

System.out.println(anyValue)

JOptionPane.showMessageDialog(null,

message)

JOptionPane.showInputDialog(

prompt-message)

Integer.parseInt(string)

Double.parseDouble(string)

Arrays.sort(type[] list)

Arrays.binarySearch(type[] list, type key)

Array/Length/Initializer

 

int[] list = new int[10];

list.length;

int[] list = {1, 2, 3, 4};

 

Multidimensional Array/Length/Initializer

int[][] list = new int[10][10];

list.length;

list[0].length;

int[][] list = {{1, 2}, {3, 4}};

 

 

Table 2.2.3 Some unicode character tables