[Solved] Object not calling the value [closed]

See it yourself :

void LoginScreen(){

//you still want to use addUser from main, so what is this ?
UserInfo addUser[100];             -----------+
 ...                                          |
}                                             |
                                              |
void main()                                   |
{                                             |
                                              |
    UserInfo addUser[100];        ------------+
...
}

You can do something like this :

void LoginScreen(UserInfo addUser[] ){ ... }

Obviously you need to remove UserInfo addUser[100]; from LoginScreen too

and then call it from main

LoginScreen(addUser) ;

Also, void main is not legal c++ use int main