Question

int main() {
    scanf("%d",&a);

    while(1) {
        switch(a) {
        case 0:
            exit(0);
        case 1:
            fp = fopen("info.txt", "r");
            if (fp == NULL)
                printf("File doest not exist! \n");
            else {
                for(i=0; !feof(fp); i++) {
                    fscanf(fp, "%s %s %s %s %s %s",
                           user[i].name,
                           user[i].surname,
                           user[i].gender,
                           user[i].status,
                           user[i].education,
                           user[i].adress);

                    printf("%s, %s, %s, %s, %s, %s\n",
                           user[i].name,
                           user[i].surname,
                           user[i].gender,
                           user[i].status,
                           user[i].education,
                           user[i].adress);
                    fclose(fp);
                }

            }
            break;
        case 2:
            for(i=0; i<N; i++) {

                printf("\nUser application data\n", i+1);
                printf("Name: ");
                gets(user[i].name);
                gets(user[i].name);
                printf("Surname: ");
                gets(user[i].surname);
                printf("Gender: ");
                gets(user[i].gender);
                printf("Status: ");
                gets(user[i].status);
                printf("Education: ");
                gets(user[i].education);
                printf("Adress: ");
                gets(user[i].adress);
                fp = fopen("info.txt", "a");
                fprintf(fp, "\n%s %s %s %s %s %s",
                        user[i].name,
                        user[i].surname,
                        user[i].gender,
                        user[i].status,
                        user[i].education,
                        user[i].adress);
                fclose(fp);
            }
        }
    }
}

好的，所以我现在有点失落。案例2我在文本文件中添加字符串完美无缺，但是当我想使用案例1查看添加到文本文件中的数据时，程序崩溃了，到目前为止我已经尝试了几件事而没有改进。非常感谢一些帮助！

Answer 1

在case 1:中，您fclose - 每次循环时都意味着在第一次循环后它将关闭文件，然后在尝试feof和fscanf时在下一个循环中，程序将失败。

从文本文件中读取和显示字符串

1 个答案: