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C++ Primer Plus(第6版)编程练习-第五章

C++ Primer Plus(第6版)编程练习-第五章

作者: 薛定鳄的简书猫 | 来源:发表于2020-06-21 17:43 被阅读0次

    内容仅供参考,如有错误,欢迎指正 !

    1.编写一个要求用户输入两个整数的程序。该程序将计算并输出这两个整数之间(包括这两个整数)所有整数的和。这里假设先输入较小的整数。例如,如果用户输入的是2和9,则程序将指出2~9之间所有整数的和为44。
    #include<iostream>
    using namespace std;
    int main()
    {
        int a, b,sum = 0;
        cout << "Please enter two integer(smaller first)" << endl;
        cout << "Please enter integer1: " ;
        cin >> a;
        cout << "Please enter integer2: " ;
        cin >> b;
        for (int i = a; i <= b; i++)
            sum = i + sum;
        cout << "The sum between integer1 and binteger2 is: " << sum << endl;
        return 0;
    
    }
    
    2.使用array对象(而不是数组)和long double(而不是long long)重新编写程序清单5.4,并计算100!的值。
    #include<iostream>
    #include<array>
    using namespace std;
    const int a = 101;
    int main()
    {
        
        array<long double, a>arr;
        arr[0] = arr[1] = 1.0;
        for (int i = 2; i <a; i++)
            arr[i] = i * arr[i - 1];
        for (int i = 0; i <a; i++)
            cout << i<<" != " << arr[i] << endl;
        return 0;
    
    }
    
    3.编写一个要求用户输入数字的程序。每次输入后,程序都将报告到目前为止,所有输入的累计和,当用户输入0时,程序结束。
    #include<iostream>
    using namespace std;
    int main()
    {
        int num, sum=0;
        for (int i=1; i!= 0;i=num)
        {
            cout << "Please enter a num(if num=0,the progream will end):_\b";
            cin >> num;
            sum += num;
            cout << "The adds of your num is: " << sum << endl;
        }
        cout << "Bye~" << endl;
            return 0;
    
    
    }
    
    4.Daphne以10%的单利投资了100美元。也就是说,每一年的利润都是投资额的10%,即每年10美元:利息=0.10*原始存款。而Cleo在第一年投资100美元的盈利是5%--一共得到105美元。下一年的盈利是105美元的5%--即5.25美元,以此类推。请编写一个程序,计算多少年后,Cleo的投资价值超过Daphne的投资价值。并显示此时两个人的投资价值。
    #include<iostream>
    int main()
    {
        using namespace std;
        double daphne = 100.0;
        double cleo = 100.0;
        int year;
        for (year = 1; cleo <= daphne; year++)
        {
            daphne += 10.0;
            cleo *= 1.05;
        }
        cout << year - 1 << " years later,Cleo's investment is worth more than Daphne's." << endl;
        cout << "Daphne has $" << daphne << endl;
        cout << "Cleo has $" << cleo << endl;
        return 0;
    }
    
    5.假设要销售《C++ For Fools》一书。请编写一个程序,输入全年中每个月的销售量(图书数量,而不是销售额)。程序通过循环,使用初始化为月份字符串的char*数组(或string对象数组)逐月进行提示,并将输入数据存储的int数组中。然后,程序计算数组中各元素的总数,并报告这一年的销售情况。
    #include<iostream>
    #include<string>
    using namespace std;
    int main()
    {
        
        string months[12] = {
            "January", "February", "March", "April", "May", "June",
            "July", "August", "September", "October", "November",
            "December"
        };
        int sales[12];
        int sum = 0;
    
        for (int i = 0; i < 12; i++)
        {
            cout << "Please enter the sales volume for " << months[i] << " : _\b";
            cin >> sales[i];
        }
    
        for (int i = 0; i < 12; i++)
        {
            cout << months[i] << " sales : " << sales[i] << endl;
            sum += sales[i];
        }
    
        cout << "Annual sales :" << sum << endl;
        return 0;
    }
    
    6.完成编程练习5,但这一次使用大的一个二位数组来存储输入---3年中每个月的销售量。程序将报告每年销量以及三年的总销量。
    #include<iostream>
    #include<string>
    using namespace std;
    int main()
    {
    
        string months[12] = {
            "January", "February", "March", "April", "May", "June",
            "July", "August", "September", "October", "November",
            "December"
        };
        int i, j, k, f,sum=0, sale[3][12];
        for (i = 0; i < 3; i++)
        {
            for(j=0;j<11;j++)
            {
                cout << "Please enter the sale nunmber of the " << i + 1 << " year " << months[j];
                cin >> sale[3][12];
            }
        }
        for (k = 0; k < 3; k++)
        {
            int annul[3] = {};
            for (f = 0; f < 11; f++)
            {
                
                annul[k] += sale[k][f];
                
            }
            sum += annul[k];
            cout << "The sales of " << k + 1 << " year is " << annul[k]<<endl;
           
        }
        cout << "The sum of 3 years is " << sum << endl;
        return 0;
    
    }
    
    7.设计一个名为car的结构,用它存储下述有关汽车的信息:生产商(存在字符数组或string对象中的字符串)、生产年份(整数)。编写一个程序向用户询问有多少辆汽车。随后,程序使用new来创建一个有相应数量的car结构组成的动态数组。接下来,程序提示用户输入每辆车的生产商(可能有多个单词组成)和年份信息。请注意,这需要特别小心,因为它将交替读取数值和字符串。最后,程序将显示每个结构的内容。该程序的运行情况如下:

    How many cars do you wish to catalog?2
    Car #1:
    Please enter the make:Hudson Hornet
    Please enter the year made:1952
    Car #2:
    Please enter the make:Kaiser
    Please enter the year made:1951
    Here is your collection:
    1952 HUdson Hornet
    1951 Kaiser

    #include<iostream>
    #include<string>
    using namespace std;
    
    struct car
    {
        string manufacturer;
        int year;
    };
    
    int main()
    {
        int number;
        cout << "How many do you wish to catalog? ";
        (cin >> number).get();
        car* p = new car[number];
        for (int i = 0; i < number; i++)
        {
            cout << "Car #" << i+1 << ":" << endl;
            cout << "Please enter the make: ";
            getline(cin, p[i].manufacturer);
            cout << "Please enter the year made: ";
           ( cin >> p[i].year).get();
        }
        cout << "Here is your collection:" << endl;
        for (int i = 0; i < number; i++)
            cout << p[i].year << " " << p[i].manufacturer << endl;
        delete[]p;
        return 0;
    }
    
    8.编写一个程序,它使用一个char数组和循环来每次读取一个单词,直到用户输入done为止。随后,该程序指出用户输入多少个单词(不包含done)。下面是程序的运行情况:

    Enter words(to stop,type the word done):
    anteater birthday category dumpster
    envy finagle geometry done for sure
    You entered a total of 7 words.

    您应在程序中包含头文件cstring,并使用strcmp()来进行比较测试。
    #include<iostream>
    #include<cstring>
    using namespace std;
    
    int main()
    {
        char word[20];
        cout << "Enter words(to stop,type the word done):" << endl;
        cin >> word;
        int num = 0;
        while (strcmp("done", word))
        {
            num++;
            cin >> word;
        }
        cout << "You entered a total of " << num << " words." << endl;
        return 0;
    }
    
    9.编写一个满足前一个练习的中描述的程序,但使用string对象而不是字符数组。请在程序中包含头文件string,并使用关系运算符来进行比较测试。
    #include<iostream>
    #include<string>
    using namespace std;
    
    int main()
    {
        string word;
        cout << "Enter words(to stop,type the word done):" << endl;
        cin >> word;
        int num = 0;
        while (word!="done")
        {
            num++;
            cin >> word;
        }
        cout << "You entered a total of " << num << " words." << endl;
        return 0;
    }
    
    10.编写一个使用嵌套循环的程序,要求用户输入一个值,指出要显示多少行。然后,程序将显示相应行数的型号,其中第一行包括一个星号,第二行包括两个星号,以此类推。每一行包含的字符数等于用户指定的行数,在星号不够的情况下,在星号前面加句点。程序的运行情况如下:

    Enter number of row :5
    ....*
    ...**
    ..***
    .****
    *****

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

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