check status of variables

[raigs]

1. How can I check if a variable has been initialized (if it exists).
2. How can I check if a variable is empty (if the variables contains data).

I'm using g++.

[Grn Xtrm]

Initializing the variable means giving it a value. Declaring a variable means to create (i.e. it exists)
As for your questions, look at the code. ;) If the variable hasn't been given a value, then it has not been initialized, it has only been declared.

[mrnutty]

You shouldn't have to, as long as you initialize you variable upon
deceleration.

You can always do this if you like :

const int NOT_INITIALIZED_VALUE = 0;
int i = NOT_INITIALIZED_VALUE ; //set to default value
int j = 4;
if(i == NOT_INITIALIZED_VALUE ) cout <<" i is not initialized\n";
if(j == NOT_INITIALIZED_VALUE ) cout <<" j is not initialized\n";