void get_account(FILE *fp)//搜索账号信息模块函数
{
    int accountnum;
    int key;
    char name[32];
    float balance;
    int i =0,j;
    char buffer[BUFFERSIZE];
    int len;
    cur_account = 0;

    fseek(fp,0,SEEK_SET);
    while(!feof(fp)) // 因为feof()最后会读2遍，所以最后curAccount多加了1
    {
        fscanf(fp,"%d %d %s %f",&accountnum,&key,name,&balance);
        accountcollection[cur_account].account = accountnum;
        accountcollection[cur_account].key = key;
        strcpy(accountcollection[cur_account].name ,name);
        accountcollection[cur_account].balance = balance;
        cur_account++;
    }
}