Debugging with Code::Blocks
Make sure that the project is compiled with the -g compiler option.
Open The Debugger Watches Window
Find the line containing the variable to be watched. Set a breakpoint in a position that will allow you to observe the variable value.
Run the debugger until the breakpoint is reached. Right click the variable to set a watch in the Watch Window.
Breakpoints may also be toggled with a left click in the left editor margin.