Page History

...

By using different variable names globally and locally, the compiler forces the developer to be more precise and descriptive with variable names.

Exceptions

DCL01:EX1: A function argument in a function declaration may clash with a variable in a containing scope, provided that when the function is defined, the argument has a name that clashes with no variables in any containing scopes.

extern int name;
void f(char *name);   // declaration: no problem here
// ...
void f(char *arg) {   // definition: no problem, arg doesn't hide name
  // use arg
}

Risk Assessment

Reusing a variable name in a subscope can lead to unintentionally referencing an incorrect variable.

...