BCDADD - add two BCD numbers.

Usage:

B:
   result = bcdadd( bcdn1, bcdn2 );

C:
   int bcdadd(int bcdn1, int bcdn2);

Description:

BCDADD assumes its two arguments both contain six numeric BCD characters. "result" receives the sum of these two BCD numbers in the same BCD format. Thus "bcdadd(`000012`,`000013`)" returns `000025`.