Path: blob/master/source/cprogramming/Ex_3.2_escape.rst
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======================================================== Exercise 3.2 - escape sequences into the real characters ======================================================== Question ======== Write a function escape(s,t) that converts characters like newline and tab into visible escape sequences like \n and \t as it copies the string t to s. Use a switch. Write a function for the other direction as well, converting escape sequences into the real characters. .. literalinclude:: ../../languages/cprogs/Ex_3.2_escape.c :language: c :tab-width: 4 .. runcode:: ../../languages/cprogs/Ex_3.2_escape.c :language: c :codesite: ideone Explanation =========== C Program interpreters ``\n`` and ``\t`` as space characters and outputs them. Our intention is to capture the ``\n`` and ``\t`` characters and display them visibly as **\n** or **\t**. In order to do that we need to *escape* them, the escaping is done by adding ``\`` character. So in the program as soon as we see a ``\n`` character, in the array where we are copying to, we copy ``\\`` character and add a ``n`` character and similarly, when we see a ``\t`` character, in the array where we are copying to, we copy ``\\`` character and add a ``t`` character. .. seealso:: * :c-suggest-improve:`Ex_3.2_escape.c` * :c-better-explain:`Ex_3.2_escape.rst`