W3 COMPUTER PROGRAMMINING 2020 SPRING

CLASS EXERCISES

Class exercises will be completed and graded in class

Eksersiz programları yazılacak ve çalıştırılacak, sınıf hocasına gösterilecektir.

W3Ex1

import javax.swing.JOptionPane;

class W3Ex1

{

public static void main(String arg[])

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

int n=Integer.parseInt(s);

int total=0;

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

{total+=i;}

String w="n = "+n+" total = "+total;

JOptionPane.showMessageDialog(null,w);

}

}

W3Ex1A

import javax.swing.JOptionPane;

class W3Ex1A

{

public static void main(String arg[])

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

int n=Integer.parseInt(s);

int total=0;

int i=0;

while(i<=n)

{total+=i;i++;}

String w="n = "+n+" total = "+total;

JOptionPane.showMessageDialog(null,w);

}

}

W3Ex1B

import javax.swing.JOptionPane;

class W3Ex1B

{

public static void main(String arg[])

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

double n=Integer.parseInt(s);

double total=0;

int i=0;

do

{total+=i;i++;}while(i<=n);

String w="n = "+n+" total = "+total;

JOptionPane.showMessageDialog(null,w);

}

}

W2Ex1C

import javax.swing.JOptionPane;

class W3Ex1C

{

public static int sum(int n)

{ int total=0;

int i=0;

while(i<=n)

{total+=i;

i++;}

return total;

}

public static void main(String arg[])

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

int n=Integer.parseInt(s);

String w="n = "+n+" total = "+sum(n);

JOptionPane.showMessageDialog(null,w);

}

}

W3Ex1D

import javax.swing.JOptionPane;

class W3Ex1D

{

public static int sum(int n)

{ int total=0;

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

{total+=i;}

return total;

}

public static int readI(String s)

{ String w=JOptionPane.showInputDialog("n = ");

int n=Integer.parseInt(w);

return n;

}

public static void print(String s)

{JOptionPane.showMessageDialog(null,s);}

public static void main(String arg[])

{ int n=readI("n = ");

double total=sum(n);

String w="n = "+n+" total = "+total;

print(w);

}}

W3Ex2 character variables

import javax.swing.JOptionPane;

public class W3Ex2

{ public static String char_list(char first_char,char last_char)

{String s="";

for(char b=first_char;b<=last_char;b++)

{s+=b+" ";}

return s;

}

public static void print(String s)

{JOptionPane.showMessageDialog(null,s);}

public static void main(String arg[])

{char c1='A';

char c2='Z';

String s=char_list(c1,c2);

print(s);

}

}

W3EX2A

import javax.swing.JOptionPane;

public class W3Ex2A

{

public static void main(String arg[])

{char c1='\u03B1';

char c2='\u03FF';;

String s=W3Ex2.char_list(c1,c2);

W3Ex2.print(s);

}

}

W3Ex3

import javax.swing.JOptionPane;

public class W3Ex3

{ public static int f(int x)

{return x*x+2*x+1;}

public static void plot(int xmin,int xmax)

{ int x=xmin;

String sum="";

String s="";

int y=0;

while(x<=xmax)

{ y=f(x); // function to be plotted

int i=0;

sum="*";

while(i<y)

{ sum = " "+sum;i++;}

s+=sum+"\n";

x++;

}

JOptionPane.showMessageDialog(null,s);

}

public static void main(String arg[])

{ plot(-10,10);}

}

W3Ex3A

import javax.swing.JOptionPane;

public class W3Ex3A

{ public static int f(int x)

{return x*x+2*x+1;}

public static void plot(int xmin,int xmax)

{

String sum="";

String s="";

int y=0;

for(int x=xmin;x<=xmax;x++)

{ y=f(x); // function to be plotted

sum="*";

for(int i=0;i<y;i++) { sum =" "+sum;}

s+=sum+"\n";

}

JOptionPane.showMessageDialog(null,s);

}

public static void main(String arg[])

{ plot(-10,10);}

}

W3Ex4

import javax.swing.JOptionPane;

public class W3Ex4

{ public static double exp(double x)

{ double power=1;

double exponent=1;

double factorial=1;

double number=1;

while(number<=200)

{

factorial*=number;

power*=x;

exponent+=power/factorial;

number++;

}

return exponent;

}

public static void main(String arg[])

{ double x=1.0;

String s="exp("+x+") = "+exp(x)+"\n";

s+="Math.exp("+x+") = "+Math.exp(x)+"\n";

JOptionPane.showMessageDialog(null,s);

}

}

W3Ex4A

import javax.swing.JOptionPane;

public class W3Ex4A

{public static double exp(double x)

{ double power=1;

double exponent=1;

double factorial=1;

for(int number=1;number<=200;number++)

{ factorial*=number;

power*=x;

exponent+=power/factorial;

}

return exponent;

}

public static void main(String arg[])

{ double x=1.0;

String s="exp("+x+") = "+exp(x)+"\n";

s+="Math.exp("+x+") = "+Math.exp(x)+"\n";

JOptionPane.showMessageDialog(null,s);

}}

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

W3HW1

By using Unicode characters complete the following program so that output will be:

import javax.swing.JOptionPane;

public class W3HW1

{ public static String char_list(int n,char first_char,char last_char)

{String s="";

int i=n;

for(char b=first_char;b<=last_char;b++)

{....................... }

return s;

}

public static void main(String arg[])

{char c1='\u2230';

char c2='\u2240';

int n=2230;

String s=char_list(n,c1,c2);

W3Ex2.print(s);

}

}

W3HW2 (if statement )

Function is given write a method public static void plot(int xmin,int xmax) to plot function see program W3Ex3

import javax.swing.JOptionPane;

public class W3HW2

{ public static int f1(int x)

{ int y=0;

if(x<0){y=x*x-3*x+14;}

else {y=2*x+14;}

return y;

}

public static void plot(int xmin,int xmax)

{......}

}

public static void main(String arg[])

{plot(-10,10);}

}

W1HW3 Following series formula is given:

The following program is given

import javax.swing.JOptionPane;

public class W3HW3

{ public static double ln(double x)

{ // -0.5 < x <0.5

double y=x-1;

double power=1;

double total=0;

if(x<-0.5 && x>0.5)

{System.out.println("Error: equation is out of range");return 0.0;}

else

{

int plusminus=1;

for(int n=1;n<=200;n++)

{ power*=y;

total+=power/n*plusminus;

plusminus*=-1;

}

return total;

}

}

public static void main(String arg[])

{ double x=0.5;

String s="ln("+x+") = "+ln(x)+"\n";

s+="Math.log("+x+") = "+Math.log(x)+"\n";

JOptionPane.showMessageDialog(null,s);

}

}

Investigate program, then change line double x=0.5; to an outside input statement then calculate

ln(-0.4) ln(-0.3) ln(-0.2) ln(0.2) ln(0.4) by using your new program

W1HW4

Write a program to calculate the number by using a for loop. They claim that number A is equal to =9.86969604401 check if it is true.

public class W3HW4

{ public static double A()

{ ......}

public static void main(String arg[])

{ double A=A();

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

s+="Pi^2 = "+Math.PI*Math.PI+"\n";

System.out.println(s);

}

}

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