C++ Primer Plus 第六版第五章课后编程练习答案

亦凉 2023-06-23 11:54 48阅读 0赞

#include <iostream>
    using namespace std;
    
    int main()
    {
        int min, max;
        cout << "Min: ";
        cin >> min;
        cout << "Max: ";
        cin >> max;
        int sum = 0;
        for(int i=min; i<=max; i++)
            sum = sum + i;
        cout << sum;
    
        return 0;
    }

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#include <iostream>
    #include <array>
    using namespace std;
    
    int main()
    {
            const int ArSize = 101;
            array<long double, ArSize> factorials; //使用array对象（而不是数组）,long double（而不是long long）
            int i;
            factorials[1] = factorials[0] = 1;
            for (i = 2; i < ArSize; i++)
                factorials[i] = i * factorials[i - 1];
            i = i - 1;
            cout << i << "! = " << factorials[i] << endl;
    
        return 0;
    }

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//每次输入，就把到目前为止输入的所有数字做加和
    #include <iostream>
    using namespace std;
    
    int main()
    {
        int num;
        int sum = 0;
        cout << "Enter number: ";
        cin >> num;
        for (; num != 0;) // 亦可 for(; num != 0; cin >> num)
        {
            sum = sum + num;
            cout << "Now the total sum is: " << sum << endl;
            cin >> num;
        }
    
        cout << "Done\n";
        return 0;
    }

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#include <iostream>
    using namespace std;
    
    int main()
    {
        double money[2] = {100, 100};
        for(int i=0; money[1] <= money[0]; i++)
        {
            money[0] = money[0] + 10;
            money[1] = money[1]*1.05;
        }
        cout << "Daphne will have " << money[0] << " and Cleo will have " << money[1];
    
        return 0;
    }

![20191224164047273.png][]

#include <iostream>
    using namespace std;
    
    int main()
    {
        int count[12];
        int total = 0;
        char* month[12] =
                {
                    "January",
                    "February",
                    "March",
                    "April",
                    "May",
                    "June",
                    "July",
                    "August",
                    "September",
                    "October",
                    "November",
                    "December"
                };
    
        for(int i=0; i<12; i++)
        {
            cout << month[i] << ": ";
            cin >> count[i];
            total += count[i];
        }
        cout << "Total is: " << total;
    
        return 0;
    }

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#include <iostream>
    using namespace std;
    
    int main()
    {
        int count[3][12];
        int total = 0;
        int sum[3] = {0, 0, 0};
        char* month[12] =
                {
                    "January",
                    "February",
                    "March",
                    "April",
                    "May",
                    "June",
                    "July",
                    "August",
                    "September",
                    "October",
                    "November",
                    "December"
                };
    
        for(int i=0; i<3; i++)
        {
            cout << "The " << i+1 << " year " << endl;
            for(int j=0; j<12; j++)
            {
                cout << month[j] << ": ";
                cin >> count[i][j];
                sum[i] += count[i][j] ;
            }
        }
        total = sum[0] + sum[1] + sum[2];
        cout << "1st year's sale is: " << sum[0] << endl;
        cout << "2nd year's sale is: " << sum[1] << endl;
        cout << "3rd year's sale is: " << sum[2] << endl;
        cout << "Total sale is: " << total;
    
        return 0;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTM4NjY2_size_16_color_FFFFFF_t_70 4][]

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#include <iostream>
    using namespace std;
    
    int main()
    {
        int num;
        struct car
        {
            string brand;
            int year;
        };
        cout << "How many cars do you wish to catalog? ";
        cin >> num;
        car* user = new car[num];
        for(int i=0; i<num; i++)
        {
            cout << "Car #" << i+1 << ":\n";
            cout << "Please enter the make: ";
            cin.get();
            //这是因为如果只使用一个该语句getline()，还不等你输入，程序会直接把后面的提示输入车辆生成年份的语句一并输出出来，
            // 正常解决办法是在getline()函数前面加一个cin.get()函数
            getline(cin, user[i].brand);
            cout << "Please enter the year made: ";
            cin >> user[i].year;
        }
        cout << "Here is your collection: \n";
        cout << user[0].year << " " << user[0].brand << endl;
        cout << user[1].year << " " << user[1].brand;
    
        return 0;
    }

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#include <iostream>
    #include <cstring>
    using namespace std;
    int main()
    {
        char word[100];
        cout << "Enter words (to tstop, type the word done):\n";
        cin >> word;
        int count=0;
    
        while (strcmp(word, "done") != 0)
        {
            if(bool(cin >> word)) count++; //必须判断bool(cin >> word)，保证连续输入
        }
        cout << "You entered a total of " << count << " words.";
    
        return 0;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTM4NjY2_size_16_color_FFFFFF_t_70 7][]

#include <iostream>
    #include <string>
    using namespace std;
    int main()
    {
        string word;
        cout << "Enter words (to tstop, type the word done):\n";
        cin >> word;
        int count=0;
    
        while (word != "done")
        {
            if(bool(cin >> word)) count++; //必须判断bool(cin >> word)，保证连续输入
        }
        cout << "You entered a total of " << count << " words.";
    
        return 0;
    }

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10.

#include <iostream>
    using namespace std;
    int main()
    {
        int num;
        cout << "Enter number of rows: ";
        cin >> num;
        for(int i=1; i<=num; i++)
        {
            for(int j=0; j<num-i; j++)
                cout << ".";
            for(int k=0; k<i; k++)
                cout << "*";
            cout << endl;
        }
    
        return 0;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5OTM4NjY2_size_16_color_FFFFFF_t_70 9][]

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[20191224164047273.png]: https://img-blog.csdnimg.cn/20191224164047273.png
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