Why can't we define a variable inside a while loop?

Question

We can do:

using (Stream s ..)

and:

for (int i ...)

Why can\'t we as well do something like:

Answer 1

As opposite to the 'for' loop, 'while' doesn't have a initialization part. The 'for' syntax looks like this:

for ( initializer; conditional expression; loop expression)
{
      statements to be executed
}

and the 'while' looks like this:

while (condition)
{
      statements to be executed
}

The closest thing to your request is:

int i;
while ((i = NextNum()) > 0) { ... }