TIOBE - C Coding Standard

SR: 11.1#1

Synopsis:	Identifiers shall not be redeclared within nested scopes.
Language:	C
Severity Level:	2
Category:	SCOPE AND LINKAGE

Description:

Such practice is almost always done inadvertently and has dangerous implications for readability.

Example:

int i;
int f()
{
    int i; /* WRONG - hides earlier declaration */
}