C++ Primer Plus（第6版）中文版 第五章学习课后题代码答案

#include 
#include
#include 
using std::cout;
using std::cin;
using std::string;

void practice1(void)
{
    int n1, n2, sum = 0;
    cout << "Input two numbers: ";
    cin >> n1 >> n2;
    for (int i = n1; i <= n2; i++)
    {
        sum += i;
    }
    cout << "Sum " << n1 << " to " << n2 << " is " << sum << std::endl;
    cout << std::endl;
    return;
}

void practice2(void)
{
    const int ArSize = 16;
    std::array  factorials{};
    factorials[1] = factorials[0] = 1LL;
    for (int i = 2; i < ArSize; i++)
    {
        factorials[i] = i * factorials[i - 1];
    }
    for (int i = 0; i < ArSize; i++)
    {
        cout << i << "! = " << factorials[i] << std::endl << std::fixed;
        cout.precision(0);
    }
    cout << std::endl;
    return;
}

void practice3(void)
{
    cout << "Input the number( 0 is over ): ";
    int i = 100, sum = 0;
    while (i != 0)
    {
        cin >> i;
        sum += i;
    }
    cout << "Sum: " << sum << std::endl;
    cout << std::endl;
    return;
}



void practice4(void)//存款利息
{
    int i;
    double Daphne = 0.10 * 100, Cleo = 0.05 * 100, sumCleo = 100.0;
    for (i = 0; Daphne > Cleo; i++)
    {
        Cleo = 0.05 * sumCleo;
        sumCleo += Cleo;
    }
    cout << "Cleo need " << i << " years to exceed Daphne.n"
        << "Daphne : " << Daphne << "nCleo : " << Cleo << std::endl;
    cout << std::endl;
    return;
}

void practice5(void)
{
    string month[12]={"Jan.","Feb.","Mar.","Apr.","May.","Jun.","Jul.","Aug.","Sept.","Oct.","Nov.","Dec."};
    int sale[12], sum = 0;
    cout << "Enter the one year sale of <> : ";
    for (int i = 0; i < 12; i++)
    {
        cin >> sale[i];
        sum += sale[i];
    }
    cout << "Thg one year sale:n";
    for (int j = 0; j < 12; j++)
    {
        cout << month[j] << " : " << sale[j] << "   ";
        if ((j + 1) % 4 == 0)
            cout << std::endl;
    }
    cout << "Total sale: " << sum << std::endl;
    cout << std::endl;
    return;
}

void practice6(void)
{
    string month[12] = { "Jan.","Feb.","Mar.","Apr.","May.","Jun.","Jul.","Aug.","Sept.","Oct.","Nov.","Dec." };
    int sale[3][12], sum = 0;
    for (int i = 0; i < 3; i++)
    {
        cout << "Enter the " << i + 1 << " year sale of << C++ For Fools >> : ";
        for (int j = 0 ; j < 12; j++)
        {
            cin >> sale[i][j];
            sum += sale[i][j];
        }
    }
    cout << "Thg the three years sale:n";
    for (int n= 0; n < 3; n++)
    {
        cout << " The " << n + 1 << " year:n";
        for (int m = 0; m < 12; m++)
        {
            cout << month[m] << ": " << sale[n][m] << "   ";
            if ((m + 1) % 4 == 0)
                cout << std::endl;
        }
        cout << std::endl;
    }
    cout << "Total sale: " << sum << std::endl;
    cout << std::endl;
    return;
}

void practice7(void)
{
    struct car
    {
        string carMake = {};
        int carYearMade = 0;
    };
    int carNumber;
    cout << "How many cars do you wish to catalog? ";
    cin >> carNumber;
    cin.get();
    car* carINFO = new car [carNumber];
    for (int i = 1; i <= carNumber; i++)
    {
        cout << "Car #" << i << std::endl
            << "Please enter the make: ";
        getline(cin, carINFO[i - 1].carMake);
        cout << "Please enter the year made: ";
        cin >> carINFO[i - 1].carYearMade;
        cin.get();
    }
    cout << "Here is your collection:n";
    for (int j = 1; j <= carNumber; j++)
    {
        cout << carINFO[j - 1].carYearMade << "  " << carINFO[j - 1].carMake << std::endl;
    }
    cout << std::endl;
    delete[] carINFO;
    return;
}

void practice8(void)
{
    char word[256] = {};
    int i;
    cout << "Enter words (to stop, type the word done): n";
    for (i = 0; strcmp(word, "done"); i++)
    {
        cin >> word;
    }
    cout << "You entered a total of " << i - 1 << " words.n";
    cout << std::endl;
    return;
}

void practice9(void)
{
    string word;
    int i;
    cout << "Enter words (to stop, type the word done): n";
    for (i = 0; word != "done"; i++)
    {
        cin >> word;
    }
    cout << "You entered a total of " << i - 1 << " words.n";
    cout << std::endl;
    return;
}





void practice10(void)
{
    int i, j, k, l;
    cout << "Input the number: ";
    cin >> i;
    char s = '*', d = '.';
    for (l = 1; l <= i; l++)
    {
        for (j = l; j < i; j++)
        {
            cout << d;
        }
        for (k = 0; k < l; k++)
        {
            cout << s;
        }
        cout << std::endl;
    }
    return;
}

int main()
{
    practice10();
    return 0;
}