Could someone help me with C++ stuff??

[silvia S13]

I am trying to do something like:


if (blahblah(a))
{
...
}

This is the function:

bool blahblah(a)
{
bool return (a=5);
}

but it's giving me undeclared identifier.
What's going on?
I have #include<iostream> and using namespace std; on top, do I need something else???

I am a freshmen in college, and just learning this, and have no clue how to do it. Someone please help. Thanks a lot.