fopen读取写入错误怎么回事

#define _CRT_NONSTDC_NO_DEPRECATE
#define _CRT_SECURE_NO_DEPRECATE
#include<assert.h>
#include<stdio.h>
#include <string>
using namespace std;
#define size 50
int main()
{
    struct student {
        int nume_student;
        char name_student[20];
        char sex_student;
        int phone_number;
        int score_yuwen;
        float score_math;
        float score_english;
        float score_pinde;
        float total_score;
        int rank;
        char attach[50];
    }stu[size];
    struct num {
        char iuy[100];
        char tyu[100];
    }nty[size];
    int i, j;
    FILE* fp;
    fp = fopen("stu.txt", "r");
    if (fp == NULL)
    {
        printf("文件未能成功打开");

    }
    else
    {
        printf("文件成功打开\n");
    }
    for (i = 0; i < 50; i++)
    {
        fscanf(fp, "%s", nty[i].iuy);
        printf("%s\n", nty[i].iuy);
        fscanf(fp, "%s", stu[i].name_student);
        printf("%s\n", stu[i].name_student);
        fscanf(fp, "%c", stu[i].sex_student);
        printf("%c\n", stu[i].sex_student);
        fscanf(fp, "%s", nty[i].tyu);
        printf("%s\n", nty[i].tyu);
        fscanf(fp, "%d", stu[i].score_yuwen);
        printf("%d\n", stu[i].score_yuwen);
        fscanf(fp, "%f", stu[i].score_math);
        printf("%f\n", stu[i].score_math);
        fscanf(fp, "%f", stu[i].score_english);
        printf("%f\n", stu[i].score_english);
        fscanf(fp, "%f", stu[i].score_pinde);
        printf("%f\n", stu[i].score_pinde);
        fscanf(fp, "%s", stu[i].attach);
        printf("%s\n", stu[i].attach);

    }
    fclose(fp);
    return 0;
}

为什么在第49行会报错？

fscanf(fp, "%d", stu[i].score_yuwen);
改为
fscanf(fp, "%d", &stu[i].score_yuwen);
后面的都有问题，fscanf读入整型，浮点型，字符型时，都需要加&

fscanf(fp, "%c", stu[i].sex_student);也要改为 fscanf(fp, "%c", &stu[i].sex_student);