当我尝试将文件读取到结构时，我的程序退出

Question

当我尝试使用菜单中的案例1将文件读取到结构中时，程序将退出。

我试图将两个文件作为单独的函数读入结构中，但是两者似乎都结束了我的函数，当我尝试将它们放到主目录中时，又发生了同样的情况。 在这个阶段，我几乎没有想法了，因为我对C语言还很陌生，只花了几周的时间。

FILE* fp;

/* structured type definition */
typedef struct empl
{
    char name[20];
    char surn[20];
    char PPS[20];
    char nat[20];
    int age;
    int mar;
    int cld;

} empl_type;

typedef struct benf
{
    char PPS[20];
    int sal;
    int pen;
    int hlt;
    int all;

} benf_type;


/* 1-dimensional array that stores benefits related data for all registered employees*/
    benf_type benf[5000];
    /* 1-dimensional array that stores employees related data */
    empl_type empl[5000];
    /* no current registered empl (no records) */
    int noempl = 0;
    /* no current benefits (no records) */
    int nobenf = 0;


/* main function */
int main()
{

    int ans = 1;

    /* welcome message */
    printf("Welcome to the program!\n");

    while(ans != 6)
    {
        printf("Menu\n");
        printf("1-Read data from files\n");
        printf("2-Apply allowance\n");
        printf("3-Search\n");
        printf("4-Print to screen\n");
        printf("5-Write data in files\n");
        printf("6-Exit\n");
        scanf("%d", &ans);

        switch(ans)
        {
            case 1: read_files(); break;
            case 2: apply_allow(benf, nobenf); break;
            case 3: search_PPS(); break;
            case 4: print_screen(); break;
            case 5: write_file(); break;
        }
    }
    printf("Goodbye!\n");

    return (EXIT_SUCCESS);
}

void read_files()
{

        noempl = read_empl_file("e.txt", empl);

        nobenf = read_benf_file("b.txt", benf);

}

int read_empl_file(char* file_name, empl_type empl[])
{

    char ch;

    /* open file */
    fp = fopen(file_name, "r");
    while(!feof(fp))
    {
        /* read on record from file */
        fscanf(fp,"%s%c%s%c%s%c%s%c%d%c%d%c%d%c", empl[noempl].name, &ch, empl[noempl].surn, &ch, empl[noempl].PPS, &ch, empl[noempl].nat, &ch, &empl[noempl].age, &ch, &empl[noempl].mar, &ch, &empl[noempl].cld, &ch);

        /* increase the number of records read*/
        noempl++;
    }

    /* close file */
    fclose(fp);
    return noempl;
}

int read_benf_file(char* file_name, benf_type benf[])
{

    char ch;

    /* open file */
    fp = fopen(file_name, "r");
    while(!feof(fp))
    {
        /* read on record from file */
        fscanf(fp,"%s%c%d%c%d%c%d%c%d%c", benf[nobenf].PPS, &ch, &benf[nobenf].sal, &ch, &benf[nobenf].pen, &ch, &benf[nobenf].hlt, &ch, &benf[nobenf].all, &ch);

        /* increase the number of records read*/
        nobenf++;
    }

    /* close file */
    fclose(fp);
    return nobenf;
}