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  STRING CONSTANT

  A string constant is a sequence of ASCII characters enclosed in
  quotes, for example, "Hello", "Good-bye", or "Telix". It is often
  necessary for a string constant to include special characters that
  can not easily be typed from the keyboard, or can not be easily dis-
  played. This is done with something called the escape character,
  which is the caret ('^') symbol. When the SALT compiler is reading a
  string constant and comes to the '^' symbol, it replaces it with a
  certain ASCII code based on the character following the ^. Transla-
  tions are as follows:

       ^c        'c' is a letter. The Control representation of what-
                 ever letter 'c' is, is inserted into the text. There-
                 fore ^M represents Ctrl-M, ^j represents Ctrl-J, etc.
                 Whether the letter 'c' is upper or lower case is not
                 significant. Note that what is really happening here
                 is that 64 is being subtracted from the value of 'c',
                 so for example, the Escape character can be repre-
                 sented as ^[.
       ^^        An actual caret ('^') symbol is placed into the text.
       ^"        An actual double quote symbol ('"') is placed into
                 the text. If a string must contain a double quote
                 symbol, this is how it has to be done. If the plain
                 '"' symbol were to be used, the compiler would think
                 that the string was terminated at that point. For ex-
                 ample, the string "He said, ^"Hello^"." is translated
                 to 'He said, "Hello".'.
       ^'        An actual single quote symbol (''') is placed into
                 the text.
       ^nnn      'nnn' is up to 3 digits representing the ASCII value
                 of the character which should be placed into the
                 text. A maximum of three digits is read, or up to the
                 first non-digit character. For example, the compiler
                 would read in the string "S^65LT" and output the
                 string "SALT", since 65 is the ASCII value of 'A'.
                 Note that if nnn is less than 3 digits you may have
                 to pad it with one or two leading zeros if there are
                 digits immediately following it in the string, so
                 that the wrong value is not read in. For example the
                 string "^79 Park Avenue" would translate to "O Park
                 Avenue" since 79 is the ASCII value of 'O'. If you
                 actually wanted Ctrl-G (ASCII code 7) followed by "9
                 Park Avenue", you would use the string "^0079 Park
                 Avenue".