編寫代碼

#include < stdio.h >

int main(int argc, char **argv)
{
    int i;
    int result = 0;

    if(1 >= argc)
    {
        printf("Helloworld.n");
    }
    printf("Hello World %s!n",argv[1]);

    for(i = 1; i <= 100; i++)  {
        result += i;
    }

    printf("result = %dn", result );

    return 0;
}

編譯時加上 -g 參數：

gcc helloworld.c -o hellowrld -g

啟動調試

$ gdb helloWorld
GNU gdb (GDB) Red Hat Enterprise Linux 8.2-12.el8
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 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-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
< http://www.gnu.org/software/gdb/bugs/ >.
Find the GDB manual and other documentation resources online at:
    < http://www.gnu.org/software/gdb/documentation/ >.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from helloworld...done.
(gdb) run                  < ----------------------------- 不帶參數運行
Starting program: /home/zhuzhg/helloworld
Missing separate debuginfos, use: yum debuginfo-install glibc-2.28-101.el8.x86_64
helloworld.
result = 5050
[Inferior 1 (process 1069013) exited normally]
(gdb) run China            < ----------------------------- 帶參數運行
Starting program: /home/zhuzhg/helloworld China
Hello World China!
result = 5050
[Inferior 1 (process 1071086) exited normally]
(gdb)