Question

我一直遇到关于for循环和数组的小问题，我希望能得到一些帮助。在第一个函数中，使用for循环调用函数的每个值都可以正常工作。但是，在第二个函数中，我从Visual Studio中得到一个错误，指出“下标需要数组或指针类型”。我在这里做错了什么导致了这个错误？

这个程序的目的是搜索书籍的txt文件，跳过条目之间的行，找出文件中有多少条目匹配以及它们在哪里，并打印出每个条目的详细信息。

void bookSearch(string id) {
    ifstream fbooks;

    string item = " ", entry = " ";

    int resultLocation[30];

    int searchType = 0;

    fbooks.open("books.txt");

    cout << "Welcome to the Book Search System, " << id << ".\n"
        << "What do you wish to search the registry by?\n"
        << "1. ISBN Number\n" << "2. Author\n" << "3. Title\n";

    while (searchType<1 || searchType>3) {
        cin >> searchType;

        if (searchType<1 || searchType>3) {
            displayMessage(0);

        }
    }

    getline(cin, item);

    for (int x = 0; x <= 30; x++) {
        for (int y = 0; y < searchType; y++)
            getline(fbooks, entry);

        if (entry == item)
            resultLocation[x] = 1;
        else
            resultLocation[x] = 0;

        for (int z = 0; z < 5; z++)
            getline(fbooks, entry);
    }

    resultPrint(resultLocation, id);
}


void resultPrint(int resultLocation, string id){
    int resultNum = 0;

    string entry = "";

    ifstream fbooks;

    fbooks.open("books.txt");

    for (int a = 0; a <= 30; a++) {
        if (resultLocation == 1)
            resultNum++;
    }

    if (resultNum > 0) {
        cout << endl << "There are " << resultNum << " entries in the database matching that criteria.\n";

        for (int a = 0; a <= 30; a++){
            if (resultLocation[a] == 1) { //The a in this line is marked with the error
                for (int b = 0; b <= 2; b++) {
                    getline(fbooks, entry);
                    cout << entry;
                }
            }
        }
    }

    else
        cout << endl << "There are no entries in the database matching that criteria.\n";
}

Answer 1

resultLocation是一个整数，因此您不能在其上使用operator[]（除了第一个“索引”之外）。看起来你打算把它变成一个数组：

void resultPrint(int resultLocation[], string id);

错误c2109：下标需要数组或指针类型5

1 个答案: