fseek

/******************************************************************************************函数功能：******fseek(文件类型指针，位移量，起始点)******文件开头 SEEK_SET 0 文件当前位置 SEEK_CUR 1 文件末尾 SEEK_END 2******fseek(fp,100L,0(1,2) )

******rewind*************************************************************************************/#include <stdio.h>#include <stdlib.h>#define SIZE 4struct student_type{char name[20];int  num;int  age;char address[20];}stu[SIZE],stu2[SIZE];void save(){    int i = 0;FILE *fp = fopen("stu_info","wb+");if (NULL == fp){perror("stu_info");exit(EXIT_FAILURE);}for (i = 0 ; i < SIZE; i++){if ( fwrite(&stu[i],sizeof(struct student_type),1,fp) != 1 ){printf("写入出错");exit(EXIT_FAILURE);fclose(fp);}}//fclose(fp);}void load(){int i = 0;FILE *fp = fopen("stu_info","rb+");if (NULL == fp){perror("stu_info");exit(EXIT_FAILURE);}//fseek(fp,sizeof(struct student_type),0);for (i = 0 ; i < SIZE; i++){fread(&stu2[i],sizeof(struct student_type),1,fp);}}void main(){int i = 0;///for (i = 0 ; i < SIZE; i++)//{//scanf("%s %d %d %s",stu[i].name,&stu[i].num,&stu[i].age,stu[i].address);//}//save();load();for (i = 0 ; i < SIZE; i++){printf("%s %d %d %s\n",stu2[i].name,stu2[i].num,stu2[i].age,stu2[i].address);}}