H2_COUNT. $1
') divert(1)dnl dnl dnl The dnl macro causes m4 to discard the rest of the line, thus dnl preventing unwanted blank lines from appearing in the output. dnl H2(First Section) H2(Second Section) H2(Conclusion) dnl divert(0)dnl dnl undivert(1)dnl One of the queues is being pushed to output.Processing this code with m4 should generate the following text:
Read more about this topic: M4 (computer Language)