A debugging line is a statement that is compiled only when the compile-time switch is activated. Debugging lines allow you, for example, to check the value of a data item at certain points in a procedure.
To specify a debugging line in your program, code a D in column 7 (the indicator area). You can include successive debugging lines, but each must have a D in column 7. You cannot break character-strings across two lines.
All your debugging lines must be written so that the program is syntactically correct, whether the debugging lines are compiled or treated as comments.
You can code debugging lines anywhere in your program after the OBJECT-COMPUTER paragraph.
A debugging line that contains only spaces in Area A and in Area B is treated as a blank line.