Compound double quotes

• What does "a"b"c" mean?
  
  
  • quoted string "a" followed by the letter b followed by quoted string "c"
    

    or

  • quoted string a"b"c
• Compound double quotes make it obvious: `"a"b"c"'
• Think of compound double quotes as similar to parentheses; they have direction to them to make it obvious what is being quoted:
  
  
  • (a(b)c) is obviously different from (a)b(c)
• programmers should use compound double quotes when referring to a macro that might contain double quotes.
• programmers could use compound double quotes everywhere in their programs
• users never need to use compound double quotes