ch3_2.cc

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#include "Stack.hh"
#include <cmath>
#include <iostream>
#include <string>
 
static void prnUIntInBin(unsigned long decUi = 0);
 
static void prnPDecInBin(double pDec = 0.0, unsigned int errP = 20);
 
int main(int argc, char const *argv[])
{
    if (argc > 1)
    {
        auto decNum = std::stod(argv[1], 0);
        if (decNum < 0)
            throw(std::string{"argv[1] should be a non-negative decimal number!"});
 
        auto IntPart = floor(decNum); //整数部分
        prnUIntInBin(IntPart);
        prnPDecInBin(decNum - IntPart);
        std::cout << std::endl;
        return 0;
    }
 
    double decNum{0.0};
 
    // Get legal input
    do
    {
        std::cout << "Please input a non-negative decimal number: " << std::endl;
        std::cin >> decNum;
        if (!std::cin.fail() && decNum >= 0)
            break;
 
        std::cin.clear();
        std::cin.sync();
    } while (true);
 
    auto IntPart = floor(decNum);
    prnUIntInBin(IntPart);
    prnPDecInBin(decNum - IntPart);
    std::cout << std::endl;
 
    return 0;
}
 
void prnUIntInBin(unsigned long decUi)
{
    Stack::linkStack<char> lst{};
    do
    {
        lst.push(decUi % 2 + '0');
        decUi /= 2;
    } while (decUi);
 
    std::cout << "Binary representation:\n";
    while (!lst.isEmpty())
        std::cout << lst.pop();
}
 
void prnPDecInBin(double pDec, unsigned int errP)
{
    std::cout << '.';
 
    if (pDec >= 1)
        throw(std::string{"Not a pure decimal!"});
 
    do
    {
        pDec *= 2;
        if (pDec >= 1)
        {
            std::cout << '1';
            --pDec;
            --errP;
            continue;
        }
        std::cout << '0';
    } while (errP && pDec);
}