[Linux]gdb调试

 exbot@ubuntu:~/CodeLearn/HelloWorld/src$ g++ -g main.cpp
 exbot@ubuntu:~/CodeLearn/HelloWorld/src$ ./a.out
 Hello world!
 exbot@ubuntu:~/CodeLearn/HelloWorld/src$ gdb a.out
 GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.) 7.4-2012.04
 Copyright (C)  Free Software Foundation, Inc.
 License GPLv3+: GNU GPL version  or later <http://gnu.org/licenses/gpl.html>
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
 and "show warranty" for details.
 This GDB was configured as "x86_64-linux-gnu".
 For bug reporting instructions, please see:
 <http://bugs.launchpad.net/gdb-linaro/>...
 Reading symbols from /home/exbot/CodeLearn/HelloWorld/src/a.out...done.
 (gdb) list
     #include<stdio.h>
     #include<iostream>
     using namespace std;
     int main()
     {
         printf("Hello world!");
         //system("pause");
         int a=;
         int b=;
         int sum=a+b;
 (gdb) b 
 Breakpoint  at 0x400699: file main.cpp, line .
 (gdb) run
 Starting program: /home/exbot/CodeLearn/HelloWorld/src/a.out
 warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff7ffa000

 Breakpoint , main () at main.cpp:
         int sum=a+b;
 (gdb) print sum
 $ =
 (gdb) print b
 $ =
 (gdb) print a
 $ =
 (gdb) next
         printf("%d",sum);
 (gdb) print sum
 $ =
 (gdb) contine
 Undefined command: "contine".  Try "help".
 (gdb) continue
 Continuing.
 Hello world![Inferior  (process ) exited normally]
 (gdb) quit