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(gcc-300.info)Mixed Declarations

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Mixed Declarations and Code
===========================

   ISO C99 and ISO C++ allow declarations and code to be freely mixed
within compound statements.  As an extension, GCC also allows this in
C89 mode.  For example, you could do:

     int i;
     ...
     i++;
     int j = i + 2;

   Each identifier is visible from where it is declared until the end of
the enclosing block.