驢子的生活日記

Mar 20 Wed 2019 09:57
2019.03 Sin正半週面積

package ch6;
public class ch6_28_2
{
   public static void main(String awgs[])
   {
       double dx=0.00001,x=0,a=0,b=0,c;
       do
       {
       a = a+(Math.sin(x))*dx;
       x=x+dx;
       b=Math.sin(x);
       System.out.println(Math.sin(x));
       }while(b>=0);
       System.out.print(a);
   }

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個人分類： JAVA 練習題目

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Mar 20 Wed 2019 09:36
2019.03 用積分法算四分之一圓

package ch6;
public class ch6_28_1
{
   public static void main(String awgs[])
   {
       double x,dx=0.0000001,a=0;
       for(x=0;x<=1;x=x+dx)
       {
           a=a+(Math.sqrt(1-(Math.pow(x, 2))))*dx;
       }
       System.out.print(a);
   }

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個人分類： JAVA 練習題目

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Mar 19 Tue 2019 22:54
2019.03 猜電腦給的數字

package ch6;
import java.io.*;
public class ch6_26_3
{
   public static void main(String awgs[])throws IOException
   {
       InputStreamReader in=new InputStreamReader(System.in);
       BufferedReader buf=new BufferedReader(in);
       int g=0,a=0,b=100,c,d;
       String hg;
       int ca;
       ca=(int)(Math.random()*100+1);
       System.out.println("let's begin for 1~100");
       do
       {
           hg=buf.readLine();
           g=Integer.parseInt(hg);
           if(g<ca)
               a=g;
           if(g>ca)
               b=g;
           if(ca!=g)
           System.out.println("wrong!"+a+" to "+b);
       }while(ca!=g);
       System.out.println(g+" is answer");
   }
}

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個人分類： JAVA 練習題目

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Mar 19 Tue 2019 22:38
2019.03 讓電腦猜數字

package ch6;
import java.io.*;
public class ch6_26_2
{
   public static void main(String awgs[])throws IOException
   {
       int ha,hg=0;
       int cg=0,cb=0,cc=100,ct=0,cont=0;
       String sha,shg;
       InputStreamReader in=new InputStreamReader(System.in);
       BufferedReader buf=new BufferedReader(in);
       System.out.println("type a number between 1~100");
       sha=buf.readLine();
       ha=Integer.parseInt(sha);
       do
       {
           cont++;
           cg=(int)(Math.random()*(cc-cb)+cb);
           ct=cg;
           System.out.println("is "+ct+"?1 for biger,2 for yes,3 for to smaller");
           shg=buf.readLine();
           hg=Integer.parseInt(shg);
           if(hg==1)
               cc=cg;
           if(hg==3)
               cb=cg;
       }while(hg!=2);
       System.out.println(ct+" is answer,for "+cont+" times");
   }

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