c++ - 未处理的异常，原点未知

这是一项家庭作业。我遇到一个奇怪的错误，不知道是什么原因引起的。这不是全部任务，但这是我到目前为止的工作。由于这是家庭作业，所以我不想让别人确切地告诉我如何编码，而是想知道是什么原因导致崩溃，以及我如何能够开始寻找解决方法。一旦在main方法中命中return语句，我的程序似乎就会崩溃。所有输出似乎正是我想要获取的，并且我的文件正在读取中。在打印完所有信息后，按Enter键，将出现一个消息框，显示“Exams.exe中0x5286ad84(msvcp100d.dll)的未处理异常:0xC0000005:访问冲突写入位置0x00000063。”
感谢您提供任何帮助。

#include <stdio.h>
#include <string>
#define MAX_STUDENTS 100
#define MAX_QUESTIONS 50
using namespace std;

int fGetAnswers(FILE *p_inputf, int p_studentIds[], string p_studentAnswers[]);
int fGetAnswers(int p_studentIds[], string p_studentAnswers[]);
void printData(int numOfStudents, int numOfQuestions, string *p_correctAnswers, int studentIds[], string studentAnswers[]);

int main(void)
{
    // Declarations
    FILE *inputf = fopen("examdat.txt", "r"); // Opens "examdat.txt" and creates a pointer to it.
    int studentIds[MAX_STUDENTS];
    int *p_ids = studentIds; // Pointer to the studentIds array to pass to functions for manipulation.
    string studentAnswers[MAX_QUESTIONS];
    string *p_answers = studentAnswers; // Pointer to the studentAnswers array to pass to functions for manipulation.
    int numOfQuestions;
    string correctAnswers;
    int numOfStudents;
    fscanf(inputf, "%d %s", &numOfQuestions, correctAnswers); // Fetches the first line from the exam.dat file which contains the number of questions and the correct answers.

    int readFrom = 0;
    while (readFrom != 1 && readFrom != 2) // Loops until proper input is received. Asks if the user wants to read student data from the text file or enter it manually.
    {
        printf("1. Read student data from file.\n");
        printf("2. Enter student data manually.\n\n");
        printf("Please make a selection> ");
        scanf("%d", &readFrom);
        if (readFrom != 1 && readFrom != 2)
            printf("\nInvalid entry!\n");
    }
    if (readFrom == 1) // Calls fGetAnswers to retrieve answers from the text file.
        numOfStudents = fGetAnswers(inputf, p_ids, p_answers);
    else // Calls fGetAnswers to retrieve answers from the user via the keyboard.
        numOfStudents = fGetAnswers(p_ids, p_answers);

    fclose(inputf);

    printData(numOfStudents, numOfQuestions, &correctAnswers, studentIds, studentAnswers);

    getchar();
    getchar();
    return(0);
}

最佳答案

由于您使用的是C++编译器，因此您可以撤消一些C习惯(越早越好!)

#include <iostream> // for std::cout and std::cin

using namespace std::cin;
using namespace std::cout;
using namespace std::endl;

代替printf(以及john指出的有关C样式字符串的问题)，请使用:

cout << numOfQuestions << "\t" << correctAnswers << endl;

您可以了解有关cout here的信息