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6.32 Mixed Declarations, Labels and Code

ISO C99 and ISO C++ allow declarations and code to be freely mixed within compound statements. ISO C2X allows labels to be placed before declarations and at the end of a compound statement. As an extension, GNU C also allows all this in C90 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.

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- © Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
- https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/Mixed-Labels-and-Declarations.html -

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