Question

您好我的程序旨在对文本文件中的记录进行排序，但我的主要问题是获取主要功能，询问用户是否要再次运行程序来读取和写入另一个文件。我的程序现在，当用户输入1再次运行时，跳过第一个问题进入要读取的程序。这是为什么？我很感激帮助！这是我的主要功能：程序仅在第一次运行时编译。

int main()
{
    int    fieldCount = 0;
    int    lineCount = 0;
    char file[STR_LEN];
    char   filepath[STR_LEN];
    char** fields = NULL;
    char** lines = NULL;
    int    recCount = 0;
    Person **sortedRecs = NULL;
    int x;

do {
    printf("Enter path of the file to read: ");
    gets(filepath);
    printf("Enter path to copy to: ");
    gets(file);
    fields = readFieldsDynamic(filepath, &fieldCount);
    lines = readLinesDynamic(filepath, &lineCount);
    recCount = getPersons(fields, fieldCount, &sortedRecs);
    if (recCount && lines && sortedRecs && (recCount <= lineCount)) {
        writeRecsToFile(file, sortedRecs, recCount, lines, lineCount);
        printf("Sorted records are written in %s\n", file);
    }
    if (fields) {
        freePointerToChars(fields, fieldCount);
    }
    if (lines) {
        freePointerToChars(lines, lineCount);
    }
    if (sortedRecs) {
        freeRecs(sortedRecs, recCount);
    }
    printf("Enter 1 to run program again: ");
    scanf("%d%*c", &x);
    } while (x == 1);
    return 0;
 }

Answer 1

您需要在％c之前保留一个空格。

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Answer 2

你可以做的是添加一个while循环来“消耗”stdin流中剩下的所有新行，以防止下一个getchar不阻止真实用户输入。

while ((ch=getchar()) != EOF && ch != '\n')
    ;

另请注意不要在代码中使用gets。请改为fgets。

Answer 3

此答案基于您的输出，如下所示：

Enter path of the file to read: /my/input/here/
Enter path to copy to: /blah/copy/here/
Enter 1 to run program again: 1
Enter path of the file to read: 
Enter path to copy to: help/I/cant/type/in/the/above/field

我的理解是你的程序可能会在循环之间传递换行符。

我在C ++中遇到过类似的问题，并在输入修复后放置cin.get()。我不确定C等价物。

C程序：Do-while循环再次运行程序不能正常工作

3 个答案: