What's wrong with this IF-statement?

Code:

---

if(cat.GetInfo() = 0)
{
        return 0;
}

---

Is it because cat.GetInto is in a class? I've never read about this before...

It's supposed to be:
cat.GetInfo() == 0.
== is comparison operator
= is assignment operator

That's right! Math got to be again. Stupid me (again!). Thanks.

Hehe, I abhor those types of errors, so simple yet alter the program totally.

Too bad the compiler doesn't have an option to automatically fix them.:D

Actually, if you use gcc with the -Wall option, it will issue warnings for this:

Code:

---

int main()
{
  int i = 0;

  if(i = 50)
    ;

  return 0;
}

---

$ g++ -Wall test.cpp
test.cpp: In function `int main()':
test.cpp:6: warning: suggest parentheses around assignment used as truth value

Sometimes you'll find people reverse the operands so that the compiler catches it, for instance in this case:

Code:

---

if(0 == cat.GetInfo())
{
    return 0;
}

---

compiles fine, whereas:

Code:

---

if(0 = cat.GetInfo())
{
    return 0;
}

---

should throw up a compilation error. That said, the argument goes, if you can remember to reverse the operands, you can remember to check for correct use of the equality operator :)