Synopsis

The definition of a local variable hides a global definition.

Enabled by default

Yes

Severity/Certainty

Medium/Medium

Full description

A local variable is declared with the same name as a global variable, hiding the global variable from this scope, from this point onwards. This might be intentional, but it is better to use a different name for the local variable, so that a reference to the global variable does not accidentally change or return the local value.

Coding standards

Code examples

The following code example fails the check and will give a warning:

int x;

int foo (int y ) {
  int x=0;
  x++;
  return x+y;
}

The following code example passes the check and will not give a warning about this issue:

int x;

int foo (int y ) {
  x++;
  return x+y;
}