//This program is designed to test the implementation of the
//the class Rational.
//File name = test_rational.cxx
//Date last changed = write date here


#include <iostream.h>
#include <stdlib.h>
#include "rational.h"


void new_line(istream& in_stream);
//Discards all the input remaining on the current input line of in_stream.
//Also discards the '\n' at the end of the line.
//Precondition: in_stream has been connected to a file with a call to open.

void wait();

int main()
{
    cout << "This program test your implementation of the class Rational.\n"
         << "If the output says\n"
         << "expression1 == expression2\n"
         << "and expression1 and expression2 DO NOT look EXACTLY the same,\n"
         <<"then there is a problem with your implementation.\n"
         << "Even if your pass this test, there still may be problems with\n"
         << "your implementation. So, we will also look at your code.\n";
    wait();

    cout << "Testing Constructors:\n"
         << "There should be no output.\n";
    Rational zero(0), one(1), two(2), three(3),
             one_half(1, 2), one_third(1, 3), minus_one_third(-1, 3),
             r1, r2;
    wait();

    cout << "Testing get_double:\n"
         << "1/2 = " << one_half.get_double() << endl
         << "The answer should be 0.5\n";
    wait();

    cout << "Testing overloaded output operator:\n"
         << one_half << " == 1/2\n"
         << one_third << " == 1/3\n"
         << zero << " == 0/1\n"
         << one << " == 1/1\n"
         << two << " == 2/1\n"
         << three << " == 3/1\n";
    wait();

    cout << "Testing to see that your constructor makes reduced forms.\n";
    Rational another_half(-2, -4);
    cout << another_half << " == 1/2\n";
    wait();

    cout << "Testing +, -, *, and /:\n";
    cout << "2 + 2 = " << (two + two) << endl
         << "The answer should be 4/1.\n";

    cout << "1/2 + 1/3 = " << (one_half + one_third) << endl
         << "The answer should be 5/6.\n";

    cout << "1/2 - 1/3 = " << (one_half - one_third) << endl
         << "The answer should be 1/6.\n";

    cout << "2/3 divided by 1/3 = " << ((2*one_third)/one_third) << endl
         << "The answer should be 2/1.\n";

    cout << "-(1/3) = " << (-one_third) << endl
         << "The answer should be -1/3.\n";

    cout << "-(-1/3) = " << (-minus_one_third) << endl
         << "The answer should be 1/3.\n";
    
    wait();

    cout << "Testing overloaded comparison operators  < and <=:\n";

    if ((one_third < one_half) && (!(one_half < one_third)))
       cout << "Test1 OK\n";
    else
       cout << "Test1 is NOT OK; problem with <\n";

    if ((one_third <= one_half) && (!(one_half <= one_third)))
       cout << "Test2 OK\n";
    else
       cout << "Test2 is NOT OK; problem with <=\n";

    if (one_third <= one_third)
       cout << "Test3 OK\n";
    else
       cout << "Test3 is NOT OK; problem with <=\n";

    wait();

    cout << "Testing overloaded comparison operators  > and >=:\n";

    if ((one_half > one_third) && (!(one_third > one_half)))
       cout << "Test4 OK\n";
    else
       cout << "Test4 is NOT OK; problem with >\n";

    if ((one_half >= one_third) && (!(one_third >= one_half)))
       cout << "Test5 OK\n";
    else
       cout << "Test5 is NOT OK; problem with >=\n";

    if (one_third >= one_third)
       cout << "Test6 OK\n";
    else
       cout << "Test6 is NOT OK; problem with >=\n";

    wait();

    cout << "Testing overloaded comparison operator ==:\n";
    
    if ((2*one_half == 3*one_third) && (! (one_half == one_third)))
       cout << "Test7 OK\n";
    else
       cout << "Test7 is NOT OK; problem with ==\n";
    wait();

    cout << "Testing overloaded input operator:\n"
         << "Enter\n"
         << " 4/-6 -4/-6\n"
         << "In other words: Enter a space followed\n"
         << "by 4/-6 followed by another\n"
         << "space followed by -4/-6\n"
         << " (note three minus signs)\n"
         << "and then press the return key.\n";
    cin >> r1 >> r2;
    new_line(cin);
    cout << r1 << " == -2/3\n";
    cout << r2 << " == 2/3\n";

    cout << "End of tests.\n";

    return 0;
}


//Uses iostream.h:
void new_line(istream& in_stream)
{
    char symbol;
    do
    {
        in_stream.get(symbol);
    } while (symbol != '\n');
}


void wait()
{
    cout << "Press return to continue to the next test.\n";
    new_line(cin);
}