C++ 从文件到链表读取日期

void readDataFromFile(President **h) {
    FILE *fp = fopen("President.txt", "r");
    if (fp == NULL) {
        printf("Cannot open a file!\n");
        return;
    }

    char buffer[MAX];
    int rno, start_date, end_date;
    char name[MAX];

    while(fgets(buffer, MAX, fp) != NULL) {
        // Reading data from line
        if (sscanf(buffer, "%d %[^\n] %d-%d", &rno, name, &start_date, &end_date) != 4) {
            printf("Error trying to read file!\n");
            fclose(fp);
            return;
        }

        // Creating of new node
        President *newNode = (President*)malloc(sizeof(President));
        if (newNode == NULL) {
            printf("Memory error!\n");
            fclose(fp);
            return;
        }
        newNode->rno = rno;
        strcpy(newNode->name, name);
        newNode->start_date = start_date;
        newNode->end_date = end_date;
        newNode->next = NULL;

        // Adding new node to list
        if (*h == NULL) {
            *h = newNode;
        } else {
            President* current = *h;
            while (current->next != NULL) {
                current = current->next;
            }
            current->next = newNode;
        }
    }

    fclose(fp);
    printf("Data is added to list!\n");
}

你好.我试图从一个文件读到另一个链表，但我总是得到一个错误原因if(Sscanf).我的代码出了什么问题？我已经判断了几次文件中的文本，但它是好的，但无论如何都不能读它.我能有一些帮助或一些有用的链接吗？如果你告诉我我可以在哪里读到它，我准备自己管理它.

以下是输入文件中的三条采样线

1 President 2000-2004 
2 President 1932-1957 
3 President 2012-2016