public class Yichang1
{
public static void main(String [] args)
{
try
{
int x=System.in.read();
}catch(Exception e){}
while(x!='q')
{
System.out.println((char)x);
try
{
x=System.in.read();
}catch(Exception e){}
}
}
}错误信息:Yichang1.java:9: cannot resolve symbol
symbol : variable x
location: class Yichang1
while(x!='q')
^
Yichang1.java:11: cannot resolve symbol
symbol : variable x
location: class Yichang1
System.out.println((char)x);
^
Yichang1.java:14: cannot resolve symbol
symbol : variable x
location: class Yichang1
x=System.in.read();
^
3 errors
{
public static void main(String [] args)
{
try
{
int x=System.in.read();
}catch(Exception e){}
while(x!='q')
{
System.out.println((char)x);
try
{
x=System.in.read();
}catch(Exception e){}
}
}
}错误信息:Yichang1.java:9: cannot resolve symbol
symbol : variable x
location: class Yichang1
while(x!='q')
^
Yichang1.java:11: cannot resolve symbol
symbol : variable x
location: class Yichang1
System.out.println((char)x);
^
Yichang1.java:14: cannot resolve symbol
symbol : variable x
location: class Yichang1
x=System.in.read();
^
3 errors
谢谢 ,可以了,但是我还是不明白,之前我还是在外面定义了x,即:int x; 就是没赋值,怎么就有错呢?
下面代码能正确运行了。
public class Yichang1
{
public static void main(String [] args)
{
int x=0;
try
{
x=System.in.read();
}catch(Exception e){}
while(x!='q')
{
System.out.println((char)x);
try
{
x=System.in.read();
}catch(Exception e){}
}
}
}