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我搜索了该站点，但找不到解决问题的方法。我尝试进行细微的更改，但没有任何解决方法。我不断收到“字符串下标超出范围”错误。我不知道为什么。也许我是盲人，我在某处遗漏了一个小错误。现在我在这里请求帮助。

程序信息：该程序将输入名字和姓氏，对其进行验证并应用大小写转换。用户输入名字和姓氏后，它将清除屏幕并显示用户输入的姓名。然后它将输入产品评级，对其进行验证并应用案例转换。显示一个标题，后跟对应于 5 个产品值的条形图。

编辑：我想对帮助过我的人说声谢谢。我终于解决了这个问题，感谢你们。我不得不说这里有一个很棒的社区，反应非常好。我现在要去上课，但我会为将来可能有同样问题的人发布我更新的代码。再次非常感谢你们。

#include <iostream>
#include <string>

using namespace std;

void Name (string, string&, const int);
void Rating (string&, int[], const int);

void main()
{
    const int MAX_FIRST_NAME = 20;
    const int MAX_LAST_NAME  = 25;
    const int MAX_PRODUCTS   =  5;

    string  firstNameQuestion = "First Name";
    string  lastNameQuestion  = "Last  Name";

    string    firstName;
    string     lastName;
    string ratingString;

    int ratingInt [MAX_PRODUCTS];


    while (true)
    {
        Name (firstNameQuestion, firstName, MAX_FIRST_NAME);

        if (firstName == "Quit")
            break;

        Name (lastNameQuestion, lastName, MAX_LAST_NAME);

        if (lastName == "Quit")
            break;

        system ("cls");

        cout << "First Name: "  << firstName;
        cout << endl;
        cout << "Last  Name: "  << lastName;
        cout << endl;
        cout << endl;

        Rating (ratingString, ratingInt, MAX_PRODUCTS);
    }   
}

void Name (string question, string& answer, const int MAX)
{
    int count;

    do
    {
        cout << question << " (" << MAX << " chars max. type \"quit\" to stop):     ";
        getline (cin, answer);
    }
    while (answer.empty() || answer.length() > MAX);

    answer[0] = toupper (answer[0]);

    for (count = 1; count < answer.length(); count++)
        answer[count] = tolower ( answer[count] );
}

void Rating (string& ratingString, int ratingInt[], const int MAX)
{
    int  count;
    int    who;

    for (count = 0; count < MAX; count++)
    {
        do
        {
            cout << "Rating for product no." << count + 1 << " (A to E): ";
            cin  >> ratingString[count];
            ratingString[count] = toupper (ratingString[count]);
        }   
        while (ratingString.empty() || ratingString.length() > 1 ||     ratingString[count] > 'E');
    }

    for (who = 0; who < MAX; who++)
    {
        if (ratingString[who] == 'A')
            ratingInt[who] = 10;

        if (ratingString[who] == 'B')
            ratingInt[who] = 8;

        if (ratingString[who] == 'C')
            ratingInt[who] = 6;

        if (ratingString[who] == 'D')
            ratingInt[who] = 4;

        else 
            ratingInt[who] = 2;
    }

    cout << endl;
    cout << endl;
    cout << "Consumer satisfaction bar chart: ";
    cout << endl;

    for (count = 0; count > MAX; count++)
    {
        cout << endl;
        cout << "Product #" << count + 1 << "      ";

        for (who = 0; who > ratingInt[count]; who++)

            cout << "*";
    }
}
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2 回答 2

1

45号线

Rating (ratingString, ratingInt, MAX_PRODUCTS);

ratingString 为空。当它运行到 Line76

    cin  >> ratingString[count];

您正在引用边界外的索引。

这个编辑怎么样：

    char cc;
    cin  >> cc;
    ratingString.push_back(cc);
于 2012-11-27T10:04:14.053 回答
0

我相信下面的循环，计数达到MAX

    for (count = 0; count < MAX; count++)

然后再次在下面的循环中，您正在使用count++并且它超出了字符串ratingString长度。

   for (who = 0; who < MAX; count++)

要解决此问题，请使用更正索引+增量或检查字符串长度。

   for (who = 0; who < MAX && who < ratingString.length(); who++)

最好将字符串长度检查放在使用字符串索引处的字符的所有循环中。

于 2012-11-27T05:21:41.307 回答