当我尝试遵循程序进行调试时，我的GDB无法显示变量的变化。
我尝试安装不同版本的GDB，但仍然遇到相同的问题。
GNU gdb (GDB) 7.6.1
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This GDB was configured as "mingw32".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from C:\Users\china\Documents\LU\SCC.150\practicals\week20\mystrtest.exe...done.
(gdb) break main
Breakpoint 1 at 0x401602: file mystrtest.c, line 26.
(gdb) run
Starting program: C:\Users\china\Documents\LU\SCC.150\practicals\week20/mystrtest.exe
[New Thread 21152.0x4fa8]
[New Thread 21152.0x5670]
Breakpoint 1, main () at mystrtest.c:26
26 char test_string_1[] = "hello world!";
(gdb) watch test_string_1
Hardware watchpoint 2: test_string_1
(gdb) cont
Continuing.
Hardware watchpoint 2: test_string_1
Old value = <error reading variable>
New value = <error reading variable>
0x00401612 in main () at mystrtest.c:26
26 char test_string_1[] = "hello world!";
(gdb)
我想查看变量的旧状态和新状态，而不是出错。