hi all,
i am programming a chip using MPLAB HI-TECH, but stuck with the empty array.
well, the program started with i declare an array to store the password, if the array is empty then the key in password will set as password.. now my problem is how to write to know the array is empty?

partial of my programming

unsigned char keyin_char[4];      //declare an 4 values for receiving password
unsigned char stalled_char[4];    // declare an 4 values password array to store the password like this correct?
if(stalled_char[4]="NULL")          // problem starts here, how to write IF array is empty then first keyin_char send to first stalled_char
{
password_count=0;
(keyin_char[0]=stalled_char[0]);
(keyin_char[1]=stalled_char[1]);
(keyin_char[2]=stalled_char[2]);
(keyin_char[3]=stalled_char[3]);
(keyin_char[4]=stalled_char[4]);
(keyin_char[5]=stalled_char[5]);
}

thanks all

er... heard bout it before but how use tat fuction? sry noobie and newbie in programming

after return then? wat i wanted is to check whether the array is empty or not.. because when a number keys in, then the array is not empty rite.. so how to check?