问'=‘和'!=’运算符重载问题

EN

using namespace std;

class Polynomial
{

public:

//constructor
Polynomial() 
    {
        for ( int i = 0; i < 100; i++ )
    {
        coefficient[i] = 0;
    }
    }

~Polynomial(){}

void polynomialSet ( Rational a , int b ) //polynomialSetter function
    {  
    coefficient[b] = a;
    exponent = b;
}

    . . . . 

    const Polynomial &Polynomial::operator=(const Polynomial &a)
{
    if (&a == this)
        return *this;
}

bool Polynomial::operator!=(Polynomial &a)
{       
    return !(*this == a);
    }

***************************************************************************
using namespace std;

class Rational {

public:
//constructors

Rational (int a, int b)
{
//Rational( const int &a, const int &b){
    if (a != 0)
    {
        if (b != 0)
        {
            this->numerator = a;
            this->denominator = b;
        }
    }
}

Rational(){}

~Rational() {}

    . . . .

    bool Rational::operator!=(Rational a)
{
    return (a.numerator != numerator) && (a.denominator != denominator);
}

Rational Rational::operator =(const Rational &a)
{
    this->numerator = a.numerator;
    this->denominator = a.denominator;
    return *this;
}

Polynomial.h(35) : error C2679: binary '=' : no operator found which takes a
right-hand operand of type 'int' (or there is no acceptable conversion)
Rational.h(99): could be 'Rational Rational::operator =(const Rational &)'
while trying to match the argument list '(Rational, int)'

Polynomial.h(53) : error C2679: binary '!=' : no operator found which takes a  
right-hand operand of type 'int' (or there is no acceptable conversion)
Rational.h(94): could be 'bool Rational::operator !=(Rational)'
while trying to match the argument list '(Rational, int)'

Polynomial.h(63) : error C2679: binary '!=' : no operator found which takes a
right-hand operand of type 'int' (or there is no acceptable conversion)
Rational.h(94): could be 'bool Rational::operator !=(Rational)'
while trying to match the argument list '(Rational, int)'

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