#include<iostream.h>
#include<fstream.h>
#include<string.h>
#include<stdlib.h>
struct status{
    char name[40];
    float balance;
    unsigned long account_number;
};
void main(){
    struct status acc;
    strcpy(acc.name,"lars klander");
    acc.balance=1234.56;
    acc.account_number=98765432;
    ofstream outbal("balance.asc",ios::out|ios::binary);
    if(!outbal) {
        cout<<"canot open output file"<<endl;exit(1);}
    outbal.write((unsigned char *)&acc,sizeof(struct status));
    outbal.close();
    ifstream inbal("balance.asc",ios::in|ios::binary);
    if(!inbal){
        cout<<"canot open file"<<endl;exit(1);
    }
    inbal.read((unsigned char *)&acc,sizeof(struct status));
    cout<<acc.name<<endl;
    cout<<"account number: "<<acc.account_number<<endl;
    cout.precision(2);
    cout.setf(ios::fixed);
    cout<<"balanced: $ "<<acc.balance<<endl;
    inbal.close();
}
请问为什么在acc前加“&”而不是“*”，加“&”的作用是什么，我试过加“*”程序报错

[[it] 本帖最后由 hank_wh 于 2008-7-21 20:29 编辑 [/it]]

……
void main(){
    struct status acc;//acc是结构体变量
……
(unsigned char *)&acc ……// 强制类型转换  &acc是结构体变量的地址，
                             指针应该指向地址

那为什么不能用指针呢？指针也不是指向结构体变量acc的地址吗？