struct Student *st;printf("\t\t\t欢迎使用课堂随机点名程序！\n\n");printf("点名前请输入您要点名的班级：");scanf("%s",filename);fp=fopen(filename,"r");while (fgets(line,99,fp)!=NULL){ strcpy(stubuff[stucnt++],line);} printf("该班一共有%d个学生\n",stucnt);srand(...