069.md

Question 69

Check the preprocessor output on file, shown in Listing defining_in_cla.asm:

%ifdef flag
hellostring: db "Hello",0
%endif 

Answer

By launching nasm -E defining_in_cla.asm we get the following output:

%line 1+1 test.asm

As we see, the file became empty because hellostring is not created. The lines between %ifdef and %endif will only be included if flag is defined using %define flag directive or -Dflag compiler option

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