我的节目是：
// By Rachit Bhargava
// Using BlueJ 3.1.0
import java.io.*;
public class Magic_Trick_1
{
public static void main(String args[])throws IOException
{
InputStreamReader in=new InputStreamReader(System.in);
BufferedReader read=new BufferedReader(in);
System.out.println("Look carefully at the follwing numbers and think of one of them!");
System.out.println("1 8 15");
System.out.println("2 9 16");
System.out.println("3 10 17");
System.out.println("4 11 18");
System.out.println("5 12 19");
System.out.println("6 13 20");
System.out.println("7 14 21");
System.out.println("Now enter the row number starting from left in which your number is");
char ch1, ch2, ch3, ch;
ch1=(char)(read.read());
if(ch1=='1')
{
System.out.println("21 20 19");
System.out.println("18 17 16");
System.out.println("15 7 6");
System.out.println(" 5 4 3");
System.out.println(" 2 1 14");
System.out.println("13 12 11");
System.out.println("10 9 8");
System.out.println("Now enter the row number starting from left in which your number is");
ch2=(char)(read.read());
if(ch2=='1')
{
System.out.println(" 9 12 1");
System.out.println(" 4 7 17");
System.out.println("20 10 13");
System.out.println(" 2 5 15");
System.out.println("18 21 8");
System.out.println("11 14 3");
System.out.println(" 6 16 19");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 2");
else if(ch3=='2')
System.out.println("Your number is 5");
else if(ch3=='3')
System.out.println("Your number is 15");
else
System.out.println("Invalid Input! :(");
}
else if(ch2=='2')
{
System.out.println("10 13 2");
System.out.println(" 5 15 18");
System.out.println("21 9 12");
System.out.println(" 1 4 7");
System.out.println("17 20 8");
System.out.println("11 14 3");
System.out.println(" 6 16 19");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 1");
else if(ch3=='2')
System.out.println("Your number is 4");
else if(ch3=='3')
System.out.println("Your number is 7");
else
System.out.println("Invalid Input! :(");
}
else if(ch2=='3')
{
System.out.println(" 9 12 1");
System.out.println(" 4 7 17");
System.out.println("20 8 11");
System.out.println("14 3 6");
System.out.println("16 19 10");
System.out.println("13 2 5");
System.out.println("15 18 21");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 14");
else if(ch3=='2')
System.out.println("Your number is 3");
else if(ch3=='3')
System.out.println("Your number is 6");
else
System.out.println("Invalid Input! :(");
}
else
System.out.println("Invalid Input :(");
}
else if(ch1=='2')
{
System.out.println(" 7 6 5");
System.out.println(" 4 3 2");
System.out.println(" 1 14 13");
System.out.println("12 11 10");
System.out.println(" 9 8 21");
System.out.println("20 19 18");
System.out.println("17 16 15");
System.out.println("Now enter the row number starting from left in which your number is");
ch2=(char)(read.read());
if(ch2=='1')
{
System.out.println("16 19 8");
System.out.println("11 14 3");
System.out.println(" 6 17 20");
System.out.println(" 9 12 1");
System.out.println(" 4 7 15");
System.out.println("18 21 10");
System.out.println("13 2 5");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 9");
else if(ch3=='2')
System.out.println("Your number is 12");
else if(ch3=='3')
System.out.println("Your number is 1");
else
System.out.println("Invalid Input! :(");
}
else if(ch2=='2')
{
System.out.println("17 20 9");
System.out.println("12 1 4");
System.out.println(" 7 16 19");
System.out.println(" 8 11 14");
System.out.println(" 3 6 15");
System.out.println("18 21 10");
System.out.println("13 2 5");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 8");
else if(ch3=='2')
System.out.println("Your number is 11");
else if(ch3=='3')
System.out.println("Your number is 14");
else
System.out.println("Invalid Input! :(");
}
else if(ch2=='3')
{
System.out.println("16 19 8");
System.out.println("11 14 3");
System.out.println(" 6 15 18");
System.out.println("21 10 13");
System.out.println(" 2 5 17");
System.out.println("20 9 12");
System.out.println(" 1 4 7");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 21");
else if(ch3=='2')
System.out.println("Your number is 10");
else if(ch3=='3')
System.out.println("Your number is 13");
else
System.out.println("Invalid Input! :(");
}
else
System.out.println("Invalid Input :(");
}
else if(ch1=='3')
{
System.out.println("14 13 12");
System.out.println("11 10 9");
System.out.println(" 8 21 20");
System.out.println("19 18 17");
System.out.println("16 15 7");
System.out.println(" 6 5 4");
System.out.println(" 3 2 1");
System.out.println("Now enter the row number starting from left in which your number is");
ch2=(char)(read.read());
if(ch2=='1')
{
System.out.println(" 2 5 15");
System.out.println("18 21 10");
System.out.println("13 3 6");
System.out.println("16 19 8");
System.out.println("11 14 1");
System.out.println(" 4 7 17");
System.out.println("20 9 12");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 16");
else if(ch3=='2')
System.out.println("Your number is 19");
else if(ch3=='3')
System.out.println("Your number is 8");
else
System.out.println("Invalid Input! :(");
}
else if(ch2=='2')
{
System.out.println(" 1 4 7");
System.out.println("17 20 9");
System.out.println("12 2 5");
System.out.println("15 18 21");
System.out.println("10 13 3");
System.out.println(" 6 16 19");
System.out.println(" 8 11 14");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 15");
else if(ch3=='2')
System.out.println("Your number is 18");
else if(ch3=='3')
System.out.println("Your number is 21");
else
System.out.println("Invalid Input! :(");
}
else if(ch2=='3')
{
System.out.println(" 2 5 15");
System.out.println("18 21 10");
System.out.println("13 1 4");
System.out.println(" 7 17 20");
System.out.println(" 9 12 3");
System.out.println(" 6 16 19");
System.out.println(" 8 11 14");
System.out.println("Now enter the row number starting from left in which your number is");
ch3=(char)(read.read());
if(ch3=='1')
System.out.println("Your number is 7");
else if(ch3=='2')
System.out.println("Your number is 17");
else if(ch3=='3')
System.out.println("Your number is 20");
else
System.out.println("Invalid Input! :(");
}
else
System.out.println("Invalid Input :(");
}
else
System.out.println("Invalid Input :(");
System.out.println("Did this program worked correctly? Enter 'Y' for yes and 'N' for no");
ch=(char)(read.read());
if(ch=='Y')
{
System.out.println("Thanks for using my program!");
System.out.println("All credits go to Rachit Bhargava!");
}
else if(ch=='N')
System.out.println("Please contact Rachit Bhargava in case of any error(s)");
else
System.out.println("Invalid Input :(");
}
}
执行该程序的结果是：
Look carefully at the follwing numbers and think of one of them!
1 8 15
2 9 16
3 10 17
4 11 18
5 12 19
6 13 20
7 14 21
Now enter the row number starting from left in which your number is
2
7 6 5
4 3 2
1 14 13
12 11 10
9 8 21
20 19 18
17 16 15
Now enter the row number starting from left in which your number is
Invalid Input :(
Did this program worked correctly? Enter 'Y' for yes and 'N' for no
N
Please contact Rachit Bhargava in case of any error(s)
它不允许我输入ch2和ch3的值，而是直接进入最后一个选项！请帮我调试程序！我最近把这个问题添加到了codereview.stackexchange.com，但是我被告知在这里发布这个问题以纠正错误！
答案 0 :(得分：0)
这里的问题是，你输入2并按下回车键。这个'enter'也是一个角色。所以基本上你一次输入2个字符。试试这个：
声明另一个角色说'temp'。 每次读到一个字符时，请插入：
temp=(char)(read.read());
例如，当您读取ch1时，请写：
ch1=(char)(read.read());
temp=(char)(read.read());
在想要阅读角色的任何地方都这样做。
由于出现此问题，建议在字符串中输入字符，然后转换为字符。
希望这有帮助！