• Compile the program gcc -g -o palindrome palindrome.c
• It generates a executable program named palindrome.
• Start the debugger with the name of executable program to be debugged. In our case, command is gdb palindrome
• The debugger out puts its prompt (gdb)

$ gdb palindrome (gdb)

• We keep first break point at the first instruction of the main function, that is the line 7, to stop the execution immediately after started.

  (gdb) break main

  Breakpoint 1 at 0x80483da: file palindrome.c, line 7.

  (gdb)