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#include <iostream>
using namespace std;
 
class RationalNumber
{
public:
	RationalNumber();	//default constructor: initializes private data to "default" values
	RationalNumber(int n = 0, int d = 1);	//constructor: initializes balance to d + c/100 and rate to r
	void setNumerator(int newnum);
	void setDenominator(int newden);
	void output();
	int getNumerator();
	int getDenominator();
	 sum();
private:
	int numerator;
        int denominator;
};
 
 
 
RationalNumber::RationalNumber(int n, int d) {
   setNumerator (n);
   setDenominator (d);
  // reduce();
}
 
void RationalNumber::setNumerator(int newnum)
{
 
		numerator = newnum;
}
 
void RationalNumber::setDenominator(int newden)
{
 
		denominator = newden;
}
 
int RationalNumber::getNumerator()
{
	return numerator;
}
int RationalNumber::getDenominator()
{
	return denominator;
}
 
void RationalNumber::output() {
 
      cout << numerator << "/" << denominator;
}
 
RationalNumber RationalNumber::sum(const RationalNumber& a) {
   Rational s;
 
   s.numerator = a.numerator * denominator + a.denominator * numerator;
   s.denominator = a.denominator * denominator;
   //t.reduce();
 
   return s;
}
 
int main()
{
	RationalNumber op1 = RationalNumber(1, -3);
	op1.output();
        RationalNumber op2 = RationalNumber(2);
	op2.output();
	RationalNumber sum = op1.add(op2);
	cout << "sum: ";
	sum.output(cout);
 
}
 
 

prog.cpp:14:7: error: ISO C++ forbids declaration of 'sum' with no type [-fpermissive]
   sum();
       ^
prog.cpp:54:16: error: prototype for 'RationalNumber RationalNumber::sum(const RationalNumber&)' does not match any in class 'RationalNumber'
 RationalNumber RationalNumber::sum(const RationalNumber& a) {
                ^
prog.cpp:14:3: error: candidate is: int RationalNumber::sum()
   sum();
   ^
prog.cpp: In function 'int main()':
prog.cpp:70:27: error: 'class RationalNumber' has no member named 'add'
  RationalNumber sum = op1.add(op2);
                           ^
prog.cpp:72:17: error: no matching function for call to 'RationalNumber::output(std::ostream&)'
  sum.output(cout);
                 ^
prog.cpp:72:17: note: candidate is:
prog.cpp:49:6: note: void RationalNumber::output()
 void RationalNumber::output() {
      ^
prog.cpp:49:6: note:   candidate expects 0 arguments, 1 provided

Standard output is empty