C++ Primer Plus 第6版 中文版 第5章编程练习

1、

#include <iostream>

using namespace std;

int main()
{
    int min, max, sum=0;

    cout << "Enter min number: ";
    cin >> min;
    cout << "Enter max number: ";
    cin >> max;

    for(int i=min; i<=max; i++)
        sum += i;

    cout << "Sum between " << min
         << " and " << max << " is "
         << sum << endl;

    return 0;
}

2、

#include <iostream>

#include <array>

using namespace std;

const int ArSize = 101;

int main()

{

    array<long double, ArSize> arr;

    arr[0] = arr[1] = 1L;

    for(int i=2; i<ArSize; i++)

        arr[i] = i*arr[i-1];

    for(int i=0; i<ArSize; i++)

        cout << i << "! = " << arr[i] << endl;

    return 0;

}

3、

#include <iostream>

using namespace std;

int main()

{

    int sum=0, num;

    cin >> num;

    while(num != 0)

    {

        sum += num;

        cin >> num;

    }

    cout << "Sum is " << sum << endl;

    return 0;

}

4、

#include <iostream>

using namespace std;

int main()

{

    double sumDaphne = 100;

    double sumCleo = 100;

    int i = 0;

    while(sumCleo <= sumDaphne)

    {

        sumDaphne += 10;

        sumCleo += sumCleo*0.05;

        i++;

    }

    cout << "After " << i << " years, sumCleo is bigger than sumDaphne." << endl;

    cout << "sumCleo = " << sumCleo << ", sumDaphne = " << sumDaphne << endl;

    return 0;

}

5、

#include <iostream>

using namespace std;

const int MON = 12;

int main()

{

    const char * monthes[MON] = {

        "Jan", "Feb", "Mar", "Apr",

        "May", "Jun", "Jul", "Aug",

        "Sep", "Oct", "Nov", "Dec"

    };

    int arr[MON] = {0};

    int sum = 0;

    for(int i=0; i<12; i++)

    {

        cout << monthes[i] << " sales are: ";

        cin >> arr[i];

        sum += arr[i];

    }

    cout << "Sum is " << sum << endl;

    return 0;

}

6、

#include <iostream>

using namespace std;

const int MON = 12;

int main()

{

    const char * monthes[MON] = {

        "Jan", "Feb", "Mar", "Apr",

        "May", "Jun", "Jul", "Aug",

        "Sep", "Oct", "Nov", "Dec"

    };

    int arr[3][MON] = {0};

    long sum = 0;

    for(int i=0; i<3; i++)

    {

        cout << "The " << (i+1) << " year:" << endl;

        for(int j=0; j<12; j++)

        {

            cout << "\t" << monthes[j] << ": ";

            cin >> arr[i][j];

            sum += arr[i][j];

        }

        cout << endl;

    }

    cout << "Sum is " << sum << endl;

    return 0;

}

7、

#include <iostream>

using namespace std;

typedef struct {

    char maker[100];

    int year;

}Car;

int main()

{

    int carNumber;

    cout << "How many cars do you wish to catalog?";

    cin >> carNumber;

    Car *pCar = new Car[carNumber];

    for(int i=0; i<carNumber; i++)

    {

        cin.get();

        cout << "Car #" << (i+1) << ":" << endl;

        cout << "Please enter the make: ";

        cin.getline(pCar[i].maker, 100);

        cout << "Please enter the year made: ";

        cin >> pCar[i].year;

    }

    cout << "Here is your collection:" << endl;

    for(int i=0; i<carNumber; i++)

    {

        cout << pCar[i].year << " " << pCar[i].maker << endl;

    }

    delete [] pCar;

    return 0;

}

8、

#include <iostream>

#include <cstring>

using namespace std;

int main()

{

    char word[100];

    int number = 0;

    cout << "Enter words (to stop, type the word done):" << endl;

    cin >> word;

    while(strcmp(word, "done"))

    {

        ++number;

        cin >> word;

    }

    cout << "You entered a total of " << number << " words.";

    return 0;

}

9、

#include <iostream>

#include <string>

using namespace std;

int main()

{

    string word;

    int number = 0;

    cout << "Enter words (to stop, type the word done):" << endl;

    cin >> word;

    while(word != "done")

    {

        ++number;

        cin >> word;

    }

    cout << "You entered a total of " << number << " words.";

    return 0;

}

10、

#include <iostream>

using namespace std;

int main()

{

    int rows = 0;

    cout << "Enter number of rows: ";

    cin >> rows;

    for(int i=1; i<=rows; i++)

    {

        for(int j=1; j<=rows; j++)

        {

            if(j < (rows-i+1))

                cout << ".";

            else

                cout << "*";

        }

        cout << endl;

    }

    return 0;

}