int main(blahblahblahwhatever)
{
fin routines. One character at a time.

ch="0";
commaCount="0";
maxComma="256"; 		// you define this
linecount=0;
cntfname="1"; 		// you define this
cntlname="12"; 		// you define this
cntdep="24"; 		// you define this

  if (ch==","){ 
    if (commaCount==maxComma) { commaCount = 0; linecount++;}
  commaCount++;
  } else {
	if (cntfname==commaCount){ fout << ch;}
	if (cntlname==commaCount){ fout << ch;}
	if (cntdep==commaCount){ fout << ch;}
 	 }

linecount++;
}