请教两道问题？

bj518 2007-09-21 10:35:38

/*　创建一个整数数组，数组大小随机产生，数组里面的整数也是随机产生的
1-1000之间的整数。*/

//这道题我怎么也不知道应该如何获得随机数，希望大家多多指点，最好加点注释

public class suijishu {
public static void main(String[] args){
int[] random = new int[];
for(int i=0;i<random.length;i++){
random[i] = (int)(Math.random()*1000) + 1;
System.out.print(random[i] + " ");
}
System.out.println();
}
}

/* 编写一个猜数字的程序，先随机产生一个1-100之间的整数，接着请用户输入猜的数字，如果猜大了就显示：“大了！”,猜小了就显示“小了！”，然后继续猜，直到猜对为止。 */

//　这道题如何让它猜对就截止

mport java.util.Scanner;
public class caidaxiao {
public static void main(String[] args){
int i;
int shu;
int[] random;
do{
System.out.print("请输入数字：");
Scanner scan = new Scanner(System.in);
shu = scan.nextInt();
random = new int[100];
for(i = 0;i < random.length;i++){
random[i] = (int)(Math.random()*100) + 1;
if(shu < random[i]){
System.out.println("小了!");
break;
}
else if(shu > random[i]){
System.out.println("大了!");
break;
}
}
}while(shu == random[i]);
}
}

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bj518 2007-09-25

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为什么没有正确答案？

chb865 2007-09-25

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第一道题：数组大小和数组里的值都是随机的
int n = (int) (Math.random() * 100);
System.out.println(n);
int[] random = new int[n];
for (int i = 0; i < n; i++) {
random[i] = (int) (Math.random() * 1000) + 1;
System.out.print(random[i] + " ");
}
}

第二道题：直到你猜对为止
int count=(int) (Math.random() * 1000);
System.out.print("请输入您要猜的数字：");
for(;;){
Scanner scan = new Scanner(System.in);
int shu = scan.nextInt();
if(shu>count){
System.out.print("您猜大了，请重新输入你要猜的数字：");
continue;
}else if(shu<count){
System.out.print("您猜小了，请重新输入你要猜的数字：");
continue;
}else{
System.out.print("恭喜您，猜对了");
break;
}
}

IhaveGotYou 2007-09-23

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让电脑傻一傻也可以....

package sunflowerbbs.oicp.net;

import java.io.*;

public class Guess {
public static void main(String[] args) {
int numGiveByPerson = 0;
String str;
boolean error = true;
while (error)
try {
System.out
.println("type a num,which between 1 and 1024.Then Let me have a guess!");
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
str = br.readLine();
numGiveByPerson = Integer.parseInt(str);
if (numGiveByPerson >= 1 && numGiveByPerson <= 1024) {
error = false;
} else
System.out.println("the num should be between 1 and 1024!");
} catch (NumberFormatException e) {
System.out.println("invalid format!");
} catch (Exception e) {
e.printStackTrace();
}
int top = 1;
int bottom = 1024;
int mid = (top + bottom) / 2;
int s = 1;
do {
System.out.println(mid + "!big or small?");
try {
str = new BufferedReader(new InputStreamReader(System.in))
.readLine();
if (str.toLowerCase().charAt(0) == 'b')
bottom = mid - 1;
else
top = mid + 1;
mid = (top + bottom) / 2;
s = s * 2;
if (s > 1024) {
System.out.println("play a joke on me! I'll Exit!");
return;
}
} catch (Exception e) {

}
} while (mid != numGiveByPerson);
System.out.println(mid + "? HaHa...");
System.out.println("you are right.how clever you are!");

}

}