total.maker=a->maker;

程序代码：

#include<iostream>
using namespace std;
struct box{
    char maker[40];
    float height;
    float width;
    float length;
    float volume;
};
void function(box a){
    cout<<a.maker<<endl<<a.height<<endl<<a.width<<endl<<a.length<<endl<<a.volume<<endl<<endl;
}
box function1(box *a){
    box total;
    total.maker=a->maker;
    total.height=a->height;
    total.width=a->width;
    total.length=a->length;
    total.volume=(a->height*a->width*a->length);
    return total;
}
int main(void){
    box aa={"asfdji",2.3,5.6,4.7,7.8};
    function(aa);
    box bb=function1(&aa);
    cout<<bb.maker<<endl<<bb.height<<endl<<bb.width<<endl<<bb.length<<endl<<bb.volume;
    return 0;
}

程序代码：

#include <iostream>

struct box
{
    char maker[40];
    float height;
    float width;
    float length;
    float volume;
};

std::ostream& operator<<( std::ostream& os, const box& a )
{
    return os << a.maker  << '\n'
                << a.height << '\n'
                << a.width  << '\n'
                << a.length << '\n'
                << a.volume << '\n';
}

using namespace std;

int main( void )
{
    box a = { "asfdji", 2.3f, 5.6f, 4.7f, 7.8f };
    cout << a << endl;

    box b = a;
    cout << b << endl;
}

std::ostream& operator<<( std::ostream& os, const box& a )

程序代码：

#include<iostream>
using namespace std;
struct box{
    char maker[40];
    float height;
    float width;
    float length;
    float volume;
};
void function(box a){
    cout<<a.maker<<endl<<a.height<<endl<<a.width<<endl<<a.length<<endl<<a.volume<<endl<<endl;
}
box function1(box *a){
    box total;
    memcpy(total.maker,a->maker,8);
    total.height=a->height;
    total.width=a->width;
    total.length=a->length;
    total.volume=(a->height*a->width*a->length);
    return total;
}
int main(void){
    box aa={"asfdji",2.3,5.6,4.7,7.8};
    function(aa);
    box bb=function1(&aa);
    cout<<bb.maker<<endl<<bb.height<<endl<<bb.width<<endl<<bb.length<<endl<<bb.volume;
    return 0;
}

memcpy(total.maker,a->maker,sizeof box::maker);

memcpy(total.maker,a->maker,sizeof(a->maker));

memcpy(total.maker,a->maker,sizeof(total.maker));

[此贴子已经被作者于2020-11-30 21:46编辑过]