mathquest.cpp

C++&datastructure书籍源码,以前外教提供现在与大家共享

#include <iostream>
#include <iomanip>
using namespace std;

#include "mathquest.h"
#include "randgen.h"
#include "strutils.h"


Question::Question()
   : myAnswer("*** error ***"),
     myNum1(0),
     myNum2(0)
{
    // nothing to initialize
}

void Question::Create()
{
    RandGen gen;
    
    myNum1 = gen.RandInt(10,20);
    myNum2 = gen.RandInt(10,20);
    myAnswer = tostring(myNum1 + myNum2);
}

void Question::Ask() const
{
    const int WIDTH = 7;
    cout << setw(WIDTH) << myNum1 << endl;
    cout << "+" << setw(WIDTH-1) << myNum2 << endl;
    cout << "-------" << endl;
    cout << setw(WIDTH-myAnswer.length()) << " ";
}

bool Question::IsCorrect(const string& answer) const
{
    return myAnswer == answer;
}

string Question::Answer() const
{
    return myAnswer;
}