"Lab 10-31 (1) product of N positive numbers"

import javax.swing.JOptionPane;
public class q1031
{
public static void main(String[] args)
{
double ans=1,one, count,i=1;
while(i>0)
{
String myString2=JOptionPane.showInputDialog("Enter a number: ");
int sum1 = Integer.parseInt(myString2);
one=sum1;
while(one>0)
{
ans=ans*one;
System.out.print( sum1 + " , ");

i++;
}

System.out.print( one + " , ");
System.out.println("Ans= "+ans);
System.exit(0);
}
}
}

Fibonacci numbers

Fibonacci numbers :

看了參考網頁中:兔子的繁殖
第一個月1對交配:(1)+0=1
第二個月產下一對: (1)+1=2
第三個月1對交配1對又產下1對:(1)+2=3
第四個月1對交配2對又各生了1對:(1+2)+2=5
第五個月2對交配3對又各生了1對:(1+2+2)+3=8

我們漸漸發現:Fibonacci numbers 的公式:
原來的兔子交配第一個月不會生之後持續生;
之後的兔子也是第一個月不會生之後持續生;

兔子繁殖

Lab exponential

import javax.swing.JOptionPane;
public class p7
{
public static void main(String[] args)
{
double n1=1,i,n2=1,count=1,count2=1,all=0,summ=0;
String sum=JOptionPane.showInputDialog("Enter a n!:");
double n = Integer.parseInt(sum);
System.out.println("N= " +n);

n2=n;
for (i=0;i<10;i++)
{

count=count*n1;


summ=n2/count;
System.out.print(summ+ " + ");
all=all+summ;
n2=n2*n;
n1++;
}
all=all+1;

System.out.println("");
System.out.println("exp= " +all );
}
}

PROJECT2.07

PROJECT2.07

import javax.swing.JOptionPane;
public class q3
{
public static void main(String[] args)
{
String mycount=JOptionPane.showInputDialog("Enter the price of item (between 25 cents and a dollar): ");
int itemPrice = Integer.parseInt(mycount);
int quarter=(100-itemPrice)/25;
int change=(100-itemPrice)-quarter*25;
int dime,nickel;

dime=change/10;
nickel=(change-dime*10)/5;

JOptionPane.showMessageDialog(null,"You bought an item for "+itemPrice+" cents and gave me a dollar.So your change is");
JOptionPane.showMessageDialog(null,+quarter+" quarters. "+dime+" dimes. "+nickel+" nickels. ");

System.exit(0);

}
}

程式結果連結

PROJECT2.05

PROJECT2.05

import javax.swing.JOptionPane;
public class q3 {
public static void main(String[] args) {

String PP=JOptionPane.showInputDialog("Enter a purchase price");
double P=Integer.parseInt(PP);
String SS=JOptionPane.showInputDialog("Enter a expected number");
double S=Integer.parseInt(SS);
String YY=JOptionPane.showInputDialog("Enter a expected salvage value ");
double Y=Integer.parseInt(YY);
double D=(P-S)/Y;
System.out.println("the purchase price of an item: "+P);
System.out.println("the expected salvage value: "+S);
System.out.println("the expected number of years of service:"+Y);
JOptionPane.showMessageDialog(null,"the yearly depreciation for the item: "+D);
System.exit(0);
}
}

程式結果連結

Lab Fibonacci numbers

public class q3 {

public static void main(String[] args){
double down=0,up=1,count=0,ratio=0;
for (int i=0;i<100;i++)
{
count=up+down;
ratio =count / up;
down = up;
up = count;
System.out.println(count + " ratio is " + ratio+ " . ");
}
}
}

程式結果連結

Lab If-Else (2)

已完成


import javax.swing.JOptionPane;
public class q1
{
public static void main(String[] args)
{


String myString=JOptionPane.showInputDialog("Enter a number: ");
int n = Integer.parseInt(myString);


if(n<0){
System.out.println("n<0,n= " +n+ " , ");
}
else if(n>=0 & n<100){
System.out.println("0<=n<100,n= " +n+ " , ");
}
else if( 100<=n )
{
System.out.println("n>=100,n= " +n+ " , ");
}
System.exit(0);
}
}

Lab Max-Min

我的寫法是輸入數字到表裡面,再找出其最大與最小值.

Lab Max-Min程式碼

備註:這是第三次的更新文章了希望程式更簡單明瞭

程式執行結果

(自行輸入有幾個數,跟數字的值)

DISPLAY3.1+輸入數字

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class q1
{
public static void main(String[] args) throws IOException
{
BufferedReader keyboard= new BufferedReader(new InputStreamReader(System.in));

double netIncome, tax, fivePercentTax, tenPercentTax;

System.out.println("Enter net income.\n"
+ "Do not include a dollar sign or any commas.");
netIncome =Integer.parseInt(keyboard.readLine());


if (netIncome <= 15000)
tax = 0;
else if ((netIncome > 15000) && (netIncome <= 30000))
//tax = 5% of amount over $15,000
tax = (0.05*(netIncome - 15000));
else //netIncome > $30,000
{
//fivePercentTax = 5% of income from $15,000 to $30,000.
fivePercentTax = 0.05*15000;
//tenPercentTax = 10% of income over $30,000.
tenPercentTax = 0.10*(netIncome - 30000);
tax = (fivePercentTax + tenPercentTax);
}

System.out.print("Tax due = " +tax);
}
}

display2.6

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class q1
{
public static void main(String[] args) throws IOException
{
BufferedReader keyboard= new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the number of pods followed by ");
System.out.println("the number of peas in a pod:");
int numberOfPods =Integer.parseInt(keyboard.readLine());
int peasPerPod =Integer.parseInt(keyboard.readLine());
int totalNumberOfPeas = numberOfPods*peasPerPod;
System.out.println(numberOfPods +" ponds and " + peasPerPod +" peas per pod .");
System.out.println("The total number of peas = " +totalNumberOfPeas+ "." );
}
}

10/17 輸入數字到視窗

import javax.swing.JOptionPane;
public class q1
{
public static void main(String[] args)
{

String myString=JOptionPane.showInputDialog("Enter a number: ");
int myNumber = Integer.parseInt(myString);
System.out.println("The number is "+ myNumber);

}
}

DISPLAY1.7&PROJECT5

DISPLAY1.7已完成

public class Untitled1 {
public static void main(String[] args)
{
String sentence = "I hate text processing!";
int position = sentence.indexOf("hate");
String ending =
sentence.substring(position + "hate".length( ));

System.out.println("01234567890123456789012");
System.out.println(sentence);
System.out.println("The word \"hate\" starts at index "
+ position);

sentence = sentence.substring(0, position) + "love"
+ ending;
System.out.println("The changed string is:");
System.out.println(sentence);
}
}


PROJECT5已完成

public class Untitled1 {
public static void main(String[] args)
{
String sentence = "I hate you";
int position = sentence.indexOf("hate");
String ending =
sentence.substring(position + "hate".length( ));
System.out.println("The line of text to be changed is:");
System.out.println(sentence);
sentence = sentence.substring(0, position) + "love"
+ ending;
System.out.println("I have rephrased that line to read:");
System.out.println(sentence);
}
}