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In the following code, it gets hung up at    cout << "Number1 * Number2 =...

In the following code, it gets hung up at

   cout << "Number1 * Number2 = " << number1 * number2 << endl;

giving an error of "no math for operator<<" what am i doing wrong?

Thank you

#include <iostream>
#include <cctype>
#include <cstdlib>
using namespace std;

class Rational //class for rational numbers (1/2, 5/9, ect..)
{
   public:
       Rational(int numerator, int denominator);
       Rational(int numberator);
       Rational(); //default
       friend istream& operator >>(istream& ins, Rational& number);
       friend ostream& operator <<(ostream& outs, Rational& number);
       friend Rational operator +(Rational& number1, Rational& number2);
       friend Rational operator -(Rational& number1, Rational& number2);
       friend Rational operator *(Rational& number1, Rational& number2);
       friend Rational operator /(Rational& number1, Rational& number2);
       bool friend operator ==(Rational& number1, Rational& number2);
       bool friend operator <(Rational& number1, Rational& number);
      
   private:
       int num; //numerator
       int den; //denominator
};

int main( )
{
   Rational number1, number2(10), number3(1,2);
  
   //Displays the values
   cout << "Number1 = " << number1 << endl;
   cout << "Number2 = " << number2 << endl;
   cout << "Number3 = " << number3 << endl;
  
   //Tests the operators
   cout << "Number1 * Number2 = " << number1 * number2 << endl;
   cout << "Number1 / Number3 = " << number1 / number3 << endl;
   cout << "Number2 + Number3 = " << number2 + number3 << endl;
   cout << "Number3 - Number1 = " << number3 - number1 << endl;
   if (number1 == number2)
       cout << "Number1 is equal to Number2" << endl;
   if (number1 < number2)
       cout << "Number1 is less than Number2" << endl;
*/

return 0;
}
Rational::Rational(int numerator, int denominator)
{
   num = numerator;
   den = denominator;
}
Rational::Rational(int numerator)
{
   num = numerator;
   den = 1;
}
Rational::Rational() : num(0), den(1)
{ }

istream& operator >>(istream& ins, Rational& number)
{
   char first, second, slash;
   int n, d;
   bool negative_num = false, negative_den = false;
  
   ins >> first;
   if (first == '-')
       {  
           negative_num = true;
           ins >> first;
       }
   ins >> n >> slash >> second;
   if (second == '-')
       {
           negative_den = true;
           ins >> second;
       }
   ins >> d;
   if (slash != '/')
       {
           cout << "Invalid input" << endl;
           exit(1);
       }
   if (negative_num)
       n = -n;
   if (negative_den)
       d = -d;
   number.num = n;
   number.den = d;
  
   return ins;
}
ostream& operator <<(ostream& outs, Rational& number)
{
   outs << number.num << '/' << number.den;
   return outs;
}
Rational operator +(Rational& number1, Rational& number2)
{
   Rational temp;
   temp.num = ( number1.num * number2.den + number2.num * number1.den );
   temp.den = ( number1.den * number2.den );
   return (temp);
}
Rational operator -(Rational& number1, Rational& number2)
{
   Rational temp;
   temp.num = ( number1.num * number2.den - number2.num * number1.den );
   temp.den = ( number1.den * number2.den );
   return (temp);
}
Rational operator *(Rational& number1, Rational& number2)
{
   Rational temp;
   temp.num = ( number1.num * number2.num );
   temp.den = ( number1.den * number2.den );
   return(temp);
}
Rational operator /(Rational& number1, Rational& number2)
{
   Rational temp;
   temp.num = ( number1.num * number2.den );
   temp.den = ( number2.num * number1.den );
   return (temp);
}
bool operator ==(Rational& number1, Rational& number2)
{
   return ( number1 == number2 );
}
bool operator <(Rational& number1, Rational& number2)
{
   return ( number1 < number2 );
}

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Homework Answers

Answer #1

Solution . The problem is not with the cout statement, the operator overloaded function for andoperator is not correct Thesint main ) Rational numberl, number2 (10), number3 (1,2) //Displays the values cout << Number2 = << number2 << endl; //Tesins >> first; if (first) negative nutrue ins >> first; ins >> n > slash second; if (second- negative den true; ins >> second;return (temp) Rational operator *(Rational& numberl, Rational&number2) Rational temp; temp.num numbe rl.num * number2. num te

Sample Output:

clusers 3023301documentsvisual studio 2010 Projectslerror Debugierror.exe Number10/1 Number210/1 Number31/2 Number1 Number30/

Raw Paste Code:

#include <iostream>
#include <cctype>
#include <cstdlib>
using namespace std;

class Rational //class for rational numbers (1/2, 5/9, ect..)
{
    public:
        Rational(int numerator, int denominator);
        Rational(int numberator);
        Rational(); //default
        friend istream& operator >>(istream& ins, Rational& number);
        friend ostream& operator <<(ostream& outs, Rational& number);
        friend Rational operator +(Rational& number1, Rational& number2);
        friend Rational operator -(Rational& number1, Rational& number2);
        friend Rational operator *(Rational& number1, Rational& number2);
        friend Rational operator /(Rational& number1, Rational& number2);
        bool friend operator ==(Rational& number1, Rational& number2);
        bool friend operator <(Rational& number1, Rational& number);
      
    private:
        int num; //numerator
        int den; //denominator
};

int main( )
{
    Rational number1, number2(10), number3(1,2);
  
    //Displays the values
    cout << "Number1 = " << number1 << endl;
    cout << "Number2 = " << number2 << endl;
    cout << "Number3 = " << number3 << endl;
  
    //Tests the operators
    cout << "Number1 * Number2 = " << number1 * number2 << endl;
    cout << "Number1 / Number3 = " << number1 / number3 << endl;
    cout << "Number2 + Number3 = " << number2 + number3 << endl;
    cout << "Number3 - Number1 = " << number3 - number1 << endl;
    if (number1 == number2)

        cout << "Number1 is equal to Number2" << endl;
   else
       cout << "Number1 is not equal to Number2" << endl;
    if (number1 < number2)
        cout << "Number1 is less than Number2" << endl;
   else
       cout << "Number2 is less than Number1" << endl;

system("pause");
return 0;
}
Rational::Rational(int numerator, int denominator)
{
    num = numerator;
    den = denominator;
}
Rational::Rational(int numerator)
{
    num = numerator;
    den = 1;
}
Rational::Rational() : num(0), den(1)
{ }

istream& operator >>(istream& ins, Rational& number)
{
    char first, second, slash;
    int n, d;
    bool negative_num = false, negative_den = false;
  
    ins >> first;
    if (first == '-')
        {  
            negative_num = true;
            ins >> first;
        }
    ins >> n >> slash >> second;
    if (second == '-')
        {
            negative_den = true;
            ins >> second;
        }
    ins >> d;
    if (slash != '/')
        {
            cout << "Invalid input" << endl;
            exit(1);
        }
    if (negative_num)
        n = -n;
    if (negative_den)
        d = -d;
    number.num = n;
    number.den = d;
  
    return ins;
}
ostream& operator <<(ostream& outs, Rational& number)
{
    outs << number.num << '/' << number.den;
    return outs;
}
Rational operator +(Rational& number1, Rational& number2)
{
    Rational temp;
    temp.num = ( number1.num * number2.den + number2.num * number1.den );
    temp.den = ( number1.den * number2.den );
    return (temp);
}
Rational operator -(Rational& number1, Rational& number2)
{
    Rational temp;
    temp.num = ( number1.num * number2.den - number2.num * number1.den );
    temp.den = ( number1.den * number2.den );
    return (temp);
}
Rational operator *(Rational& number1, Rational& number2)
{
    Rational temp;
    temp.num = ( number1.num * number2.num );
    temp.den = ( number1.den * number2.den );
    return(temp);
}
Rational operator /(Rational& number1, Rational& number2)
{
    Rational temp;
    temp.num = ( number1.num * number2.den );
    temp.den = ( number2.num * number1.den );
    return (temp);
}
bool operator ==(Rational& numb1, Rational& numb2)
{
   if((numb1.num/numb1.den)==(numb2.num/numb2.den))
       return true;
   else
       return false;
}
bool operator <(Rational& number1, Rational& number2)
{
   if((number1.num/number1.den)<(number2.num/number2.den))
       return true;
   else
       return false;
}

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