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test.cc
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test.cc
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#include "Ratio.h"
#include <cassert>
#include <fstream>
#include <iostream>
#include <stdexcept>
using std::cerr;
using std::cout;
using std::ifstream;
using std::runtime_error;
int main() {
Ratio f12(-2,-4), f34(3L,4L), seven_eights = Ratio(7).divide(Ratio(8));
const Ratio f78(seven_eights), one(f34.divide(f34));
assert(f12.numerator() == 1);
assert(f12.denominator() == 2);
assert(f12.ratio() == 0.5);
assert(f34.ratio() == 0.75);
assert(f78.ratio() == 0.875);
assert(f12.add(f34).multiply(f78).ratio() == 1.09375);
assert(f12.ratio() == 0.5);
assert(f34.ratio() == 0.75);
assert(f78.ratio() == 0.875);
assert(Ratio(1,5).add(Ratio(1,7)).compare(Ratio(12,35)) == 0);
assert(f12.compare(f34) < 0);
assert(f34.compare(f12) > 0);
assert(f34.compare(Ratio(-66,-88)) == 0);
assert(f12.add(f34).compare(Ratio(5,4)) == 0);
assert(f12.add(f34).ratio() == 1.25);
assert(f12.add(f34).compare(1.25L) == 0);
assert(f12.add(f34, f78, f12, f34, f78).ratio() == 4.250);
assert(f34.add(one,one,one,one,one,one,one,one).ratio() == 8.75);
Ratio r(42, 666);
r.numerator(0);
r.numerator(700);
r.denominator(-3000);
assert(r.numerator() == -7);
assert(r.denominator() == 30);
cout << "Should be |-7/30|: |" << r << "|\n";
ifstream in("data");
if (!in) {
cerr << "Can’t open data\n";
return 1;
}
while (in >> r)
cout << "»»» " << r << '\n';
try {
r.denominator(0);
cout << "Should not get here.\n";
}
catch (const runtime_error &err) {
cout << "Error detected: " << err.what() << '\n';
}
return 0;
}