Initializing the class member in class function gives me wrong output

why does the output of value of b = 1 ?

I have below code:

Code:

---

class test
{
        int a;
        public:
        int b;
        int geta();
};

int test::geta()
{
  a=100;        b=200; return a;
}

int main()
{
        test obj;
        cout<< "value of a:" <<obj.geta() <<" value of b:" <<obj.b <<'\n';
        return 0;
}

---

It doesn't... You must be setting it someplace else, not shown here.

The order of evaluation of function arguments is unspecified, so you cannot depend on obj.geta() being evaluated before obj.b, since a possible order of evaluation exists such that obj.b is evaluated before obj.geta().

You should have declared geta to be const, though then you wouldn't be able to modify a or b unless you declared them mutable.

EDIT:
Oh, I notice that you didn't even initialise b to be 1... so either GReaper's guess is correct, or you're looking at the result of printing an uninitialised variable. Did you really test the code that you posted? You left out the header inclusions, and cout is within the std namespace.

Thanks for the replies...


I have not mentioned the headers here , though I have them while executing .No initializations to 1 were made.

Well, for what it's worth, what you should have done was this:

Code:

---

class test
{
public:
    int b = 200;

    int geta() const
    {
        return a;
    }
private:
    int a = 100;
};

---