文件处理中，发生错误

Question

#include "stdio.h"

main() {
    FILE *fp;
    int num = 0;
    float x, y, z;
    fp = fopen("cj.dat", "r");
    while (!feof(fp)) {
        fscanf(fp, "%f,%f,%f", &x, &y, &z);
        if ((x + y + z) / 3 >= 90)
            num = num + 1;
    }
    printf("平均成绩在90分以上的学生人数：%2d人\n", num);
    fclose(fp);
}

Answer 1

修改如下，供参考：

#include <stdio.h>
int main()
{
    FILE *fp;
    int num = 0;
    float x, y, z;
    fp = fopen("cj.dat", "r");
    if (fp == NULL){               //修改
        printf("file open fail!\n");
        return 1;
    }
    while (1) { //while (!feof(fp)
        if (fscanf(fp, "%f,%f,%f", &x, &y, &z) != 3) break; //修改
        if ((x + y + z) / 3 >= 90)
            num = num + 1;
    }
    fclose(fp);
    printf("平均成绩在90分以上的学生人数：%2d人\n", num);
    return 0;
}