how to use a global vars in QT?

[FelixB]

The compiler says may be used uninitialized in this function.

you have two functions. "function_name_1" initializes "var_name". "function_name_2" uses "var_name". What happens if you call "function_name_2" before you call "function_name_1"? - BINGO, you'd use an uninitialized variable, as the compiler said...

[tbscope]

What happens if you call "function_name_2" before you call "function_name_1"? - BINGO, you'd use an uninitialized variable, as the compiler said...

That doesn't even matter, even if function_name_1 is called before function_name_2, var_name is uninitialised.

[FelixB]

That doesn't even matter, even if function_name_1 is called before function_name_2, var_name is uninitialised.

oh, now I see. he redefines "var_name"...