提示:玩家选择一个范围(最小和最大),然后在该范围内考虑一个数字(不需要在程序中输入数字)。游戏应该使用二分搜索来系统地猜测玩家的号码。玩家应该在回合间告诉电脑"太高"或"太低"或"正确"。该程序应该继续运行,直到计算机得到答案,或检测到作弊(或确定知道答案)。在退出之前,计算机应该告诉它有多少"轮"(猜了多少次)。
问题:在计算机第一次出错后,用户声明了过高或过低,我无法为上限和下限重新赋值
import java.util.Scanner;
public class TestPractice {
public static void main(String[] args) {
System.out.println("Think of a number");
Scanner scan = new Scanner(System.in);
String x = null;
String y = null;
String i = null;
//Get the input from the player
System.out.println("Please your maximum value");
if (scan.hasNext()) {
x = scan.next();
}
System.out.println("Please input your min value");
if (scan.hasNext()) {
y = scan.next();
}
//Parse the input so its usuable in the array
int max = Integer.parseInt(x);
int min = Integer.parseInt(y);
boolean numberguessed = true;
int numberofRounds = 0;
while(numberguessed) {
int midpoint = (max+min)/2;
numberofRounds++;
System.out.println("Is your number " + midpoint + " please say too low or too high or correct");
if (scan.hasNext()) {
i = scan.next();
}
if (i.equalsIgnoreCase("too high")) {
min = midpoint;
}
if (i.equalsIgnoreCase("too low")) {
max = midpoint;
min = 0;
}
if (i.equalsIgnoreCase("correct")) {
System.out.println("the number of rounds in this game is" + numberofRounds);
break;
}
}
}
}
您需要使用scan.nextLine()
而不是scan.next()
来读取行中的所有内容,包括space
字符,这就是为什么最大值和最小值从未设置在首位的原因。
Scanner使用分隔符模式将其输入分解为多个令牌,默认情况下匹配空格。
关于扫描仪的更多信息
要再次循环整个游戏,请查看do {} while(true);
迭代。
System.out.println("Think of a number");
Scanner scan = new Scanner(System.in);
String playAgain = "y";
String x = null;
String y = null;
String i = null;
do {
// Get the input from the player
System.out.println("Please your maximum value");
if (scan.hasNext()) {
x = scan.next();
}
System.out.println("Please input your min value");
if (scan.hasNext()) {
y = scan.next();
}
// Parse the input so its usuable in the array
int max = Integer.parseInt(x);
int min = Integer.parseInt(y);
int midpoint = 0;
boolean numberguessed = true;
int numberofRounds = 0;
while (numberguessed) {
midpoint = (max + min) / 2;
numberofRounds++;
System.out.println("Is your number " + midpoint
+ " please press (l) for too low or (h) for too high or (c) for correct");
if (scan.hasNext()) {
i = scan.nextLine();
}
System.out.println(i);
if (i.equalsIgnoreCase("h")) {
min = midpoint;
} else if (i.equalsIgnoreCase("l")) {
max = midpoint;
min = 0;
} else if (i.equalsIgnoreCase("c")) {
System.out.println("the number of rounds in this game is"
+ numberofRounds);
break;
}
}
System.out.println("Press y to play again");
if (scan.hasNext()) {
playAgain = scan.next();
}
System.out.println("Game over");
} while (playAgain.equalsIgnoreCase("y"));
关于do的更多信息
建议使用简单的是/否回答,如h,l和c,而不是让用户写一个单词。