Overloading operator>> - class errors

[Demoris]

I have a class that I believe should work. I've compared it to previous programs I've written, compared it to examples from my professor, to examples in my textbook, but can't see why I get the errors I get when building.

All errors take place in the line

friend istream& operator>>(istream& ins, QuadPolyn& P);

Please note this is NOT an assignment, just an example of what we should be able to do.

#ifndef quadpolyn_h
#define quadpolyn_h
 
class QuadPolyn
{
friend istream& operator>>(istream& ins, QuadPolyn& P);
 
public:
    QuadPolyn();
    QuadPolyn(double a2, double a1, double a0);
    double At(double v) const;
    bool Valid() const;
    bool getRoots(double& r1, double& r2);
 
private:
    double a, b, c; // coefficients
};
 
#endif

error C2143: syntax error : missing ';' before '&'
error C2433: 'istream' : 'friend' not permitted on data declarations
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C2061: syntax error : identifier 'istream'
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C2805: binary 'operator >>' has too few parameters

[horace1]

once I had included <iostream> your fragment of code compiles OK using g++, Visual C and C Builder 5. What compiler are you using?

[Demoris]

once I had included <iostream> your fragment of code compiles OK using g++, Visual C and C Builder 5. What compiler are you using?

Visual Studio 2005. Tried to build again today, same errors.

[weaknessforcats]

I just compiled your code fragment using my Visual Studio,.NET 2005 and got no errors.

What does the rest of your code look like??

Remember, when you get an error from the compiler it points to the place where the compiler knew it was in trouble. That actual cause of the error can be anywhere from there to the top of the code in that file.