Chapter 18

Add a second constructor.

// A Fraction class with two constructors

#ifndef FRACTION_H
#define FRACTION_H
class Fraction {
public:
    Fraction();               // Default constructor
    Fraction(int n, int d) : numerator{n}, denominator{d} {}; // Allow setting numerator and denominator
    ~Fraction();              // Destructor
    void get();               // Get user's values
    void display();           // Display fraction
    void add_integer(int x);  // Adds x to fraction
private:
    int numerator; 
    int denominator; 
};
#endif

// A Fraction class with two constructors

#include "fraction.h"
#include <iostream>
using namespace std;

Fraction::Fraction()
{
    numerator = 0;
    denominator = 1;
}

Fraction::~Fraction() {}
// Nothing to do for this object

void Fraction::get()
{
    cout << "Enter numerator: ";   
    cin >> numerator;
      
    cout << "Enter denominator: ";
    cin >> denominator;

    if (denominator == 0) {
        cout << "WARNING: Setting 0 denominator to 1\n";
        denominator = 1;
    }
}

void Fraction::display()
{
    cout << numerator << '/' << denominator << '\n';
}

void Fraction::add_integer(int x)
{
    numerator += x * denominator;
}

// Get 2 fractions from user and add 1.

#include <iostream>
#include "fraction.h"
using namespace std;

int main(void)
{
    Fraction my_fraction;
    Fraction your_fraction(12, 34);

    cout << "My fraction:" << '\n';
    my_fraction.display();
    my_fraction.get();
    my_fraction.add_integer(1);
    my_fraction.display();

    cout << "Your fraction:" << '\n';
    your_fraction.display();
    your_fraction.get();
    your_fraction.add_integer(1);
    your_fraction.display();

    return 0;
}

«««< Updated upstream

Build a fraction with user input.

16 * index in each array element.

Stashed changes ```cpp // Fraction class with two constructors

#ifndef FRACTION_H #define FRACTION_H class Fraction { public: Fraction() = default; // tell compiler to generate default Fraction(int n, int d) :numerator{n}, denominator{d} {}; ~Fraction() = default; void display(); // displays fraction void add_integer(int x); // adds x to fraction private: int numerator {123}; // weird values so we can see int denominator {456}; // what compiler is doing }; #endif

```cpp
// Fraction class with two constructors

#include <iostream>
#include "fraction.h"
using namespace std;

void Fraction::display()
{
    cout << numerator << '/' << denominator << '\n';
}

void Fraction::add_integer(int x)
{
    numerator += x * denominator;
}

// Create a fraction with user input and increment it by one.

#include <iostream>
#include "fraction.h"
using namespace std;

int main(void)
{
    int numerator, denominator;

    cout << "Enter a numerator: ";
    cin >> numerator;
    cout << "Enter a denominator: ";
    cin >> denominator;

    Fraction x(numerator, denominator);
    x.display();
    x.add_integer(1);
    x.display();

    return 0;
}

Chapter 18

Build a fraction with user input.