如何将元素添加到对象矢量并打印它们？

Our teacher told us to create a vector of objects and perform operations on it, but I couldn't understand how to properly do that: I tried to make a simple project with minimum data so that I could know what I was doing.

我们的老师告诉我们创建一个对象向量并对其执行操作,但我无法理解如何正确地做到这一点:我尝试用最少的数据创建一个简单的项目,这样我就可以知道我在做什么。

I have this class

我有这门课

class Obj {

    private:

        int num;

    public:

        Obj();

        void setNum(int nuovo_num);
        int getNum();

};

And then this one, with a vector of Obj

然后是这个,带有Obj的向量

class VettObj{

    private:

        vector<Obj> vett;

    public:

        VettObj();

        void setVett();
        void stampaVett();

};

My initial thought was to use an iterator but I was just making a total mess and, with almost useless research, I decided to use a common integer counter.

我最初的想法是使用迭代器,但我只是弄得一团糟,而且几乎无用的研究,我决定使用一个通用的整数计数器。

I found that I shouldn't write anything in the VettObj costructor, as it automatically initialize stuff, so I left it blank.

我发现我不应该在VettObj costructor中写任何东西,因为它会自动初始化东西,所以我把它留空了。

The method that adds elements is this

添加元素的方法就是这样

void VettObj::setVett(){


    Obj temp;
    int i;

    i = 0;
    while(i < 5){


        temp.setNum(10);

        vett.push_back(temp);

        i++;
    }

}

And the one that prints elements

而打印元素的那个

void VettObj::stampaVett(){


    int i;

    i = 0;
    while(i < 5){

        vett[i].getNum();

        i++;
    }

}

When I compile, everything goes well, but when I run the program I get nothing on the screen. I don't want to use mostly vector functions(if not necessary) as I saw that a lot of people can do it like this. I would really like to know how to do it with iterators too. Help pls ????

当我编译时,一切顺利,但是当我运行程序时,屏幕上什么都没有。我不想使用大多数矢量函数(如果没有必要),因为我看到很多人都可以这样做。我真的很想知道如何使用迭代器。帮帮忙吧?

1 个解决方案

#1

You are not actually printing anything in the stampaVett() method. You could try with:

你实际上并没有在stampaVett()方法中打印任何东西。你可以尝试:

void VettObj::stampaVett(){

    int i = 0;

    while (i < 5){

        std::cout << vett[i].getNum();

        i++;
    }

}

I'd also suggest using English for method or variable instead of Italian, since SO is an international community.

我也建议使用英语作为方法或变量而不是意大利语,因为SO是一个国际社区。

#1