Can variables be used as arguments in a function call?????

This is driving me nuts!  Here's my code:


int16 AvailRAM;  //global variable

void test_ram()
{
    int16 addr=0;   //local variable

    do
    {
        write_ram(addr, 0xAA);       //write 0xAA to each ram location
    } while(read_ram(addr++)==0xAA);   //until a bad or non-existant
location is reached
    AvailRAM = addr-1;
}


Here's the error:
Error[107]   C:\LOW.C 610 : Structures and Unions can not be parameters (use
* or &)
Line 610 is the write_ram(addr, 0xAA); line

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