What C++ Standard about this?

[dh]

Hi all,

int a = 1;

for(int a = 12; ...)
{
....
}

// Does value of a here have anything to do with "int a = 1;" scope, or the
"for" scope?

Thanks,
DH

 

[Shan]

Does value of a here have anything to do with "int a = 1;" scope, or
the

"for" scope?

The "a" in the for loop is in the scope of for loop alone and will not
have any effect on "a" before for loop.

Regards
Shan

 

[Mike Hewson]

Hi all,

int a = 1;

for(int a = 12; ...)
{
....
}

// Does value of a here have anything to do with "int a = 1;" scope, or the
"for" scope?

The second 'a' has scope from it's declaration until the end of the for
loop, it 'hides' the first 'a' meantime. The first 'a' will be used ( if
at all ) either up until the for and/or after the closing brace of the
for. ( NB. It's legal but I think confusing practise to do this ).