如何在C++中传递向量作为参数 < >我需要创建一个C++程序，它实现和= NUM1+NUM2，和= NUM1-NUM2，和= NUM1*NUM2，其中，和，NUM1，NUM2是包含存储整数的向量的对象。我需要为此使用运算符重载。这是我提出的代码，但我无法理解这些错误的原因。我将向量声明为'std:：vector n；'并尝试将另一个向量作为参数传递给函数。对于栈溢出和C++编程，我都是新手。 #include<iostream> using namespace std; class NUM { private: std::vector<int> n ; public: //function to get number void getNum(std::vector<int> x) { n=x; } //function to display number void dispNum(void) { cout << "Number is: " << n; } //add two objects - Binary Plus(+) Operator Overloading NUM operator +(NUM &obj) { NUM x; //create another object x.n=this->n + obj.n; return (x); //return object } }; int main() { NUM num1,num2,sum; num1.getNum(10); num2.getNum(20); //add two objects sum=num1+num2; sum.dispNum(); cout << endl; return 0; }

这些是我得到的错误

main.cpp:7:14: error: ‘vector’ in namespace ‘std’ does not name a template type
         std::vector<int> n ;
              ^~~~~~
main.cpp:11:26: error: ‘std::vector’ has not been declared
         void getNum(std::vector<int> x)
                          ^~~~~~
main.cpp:11:32: error: expected ‘,’ or ‘...’ before ‘<’ token
         void getNum(std::vector<int> x)
                                ^
main.cpp: In member function ‘void NUM::getNum(int)’:
main.cpp:13:13: error: ‘n’ was not declared in this scope
             n=x;
             ^
main.cpp:13:15: error: ‘x’ was not declared in this scope
             n=x;
               ^
main.cpp: In member function ‘void NUM::dispNum()’:

main.cpp:18:38: error: ‘n’ was not declared in this scope
             cout << "Number is: " << n;
                                      ^
main.cpp: In member function ‘NUM NUM::operator+(NUM&)’:

main.cpp:24:15: error: ‘class NUM’ has no member named ‘n’
             x.n=this->n + obj.n;
               ^
main.cpp:24:23: error: ‘class NUM’ has no member named ‘n’
             x.n=this->n + obj.n;
                       ^
main.cpp:24:31: error: ‘class NUM’ has no member named ‘n’
             x.n=this->n + obj.n;

---

您没有包含导致错误的向量头

#include <iostream>
#include <vector>
using namespace std;

这将解决错误。 或者您可以改为包含标题

#include <bits/stdc++.h>
using namespace std;

---

这将同时包括整个标准库。

您至少缺少了include，这修复了许多错误。getNum看起来很奇怪。我不认为它做了你认为它做的，而且你期望的是一个向量，但传递的是一个数字。我建议你至少要熟悉基本概念。既不直接包含任何内容，也不包含整个标准库都是一个好主意。

#include<iostream>
#include <vector>
#include <algorithm>
using namespace std;

class NUM
{
    private:
    std::vector<int> n ;

    public:
        //function to get number
        void getNum(std::vector<int> x)
        {
            n=x;
        }
        //function to display number
        void dispNum(void)
        {
            cout << "Number is: " <<endl;
            for_each(n.begin(),n.end(),[](int i){cout <<i<<endl;});
        }
        //add two objects - Binary Plus(+) Operator Overloading
        NUM operator +(NUM &obj)
        {
            NUM x;  //create another object
            //x.n=this->n + obj.n;
            if(this->n.size() == obj.n.size())
                for (int i = 0; i < this->n.size(); ++i) {
                    x.n.push_back(this->n.at(i)+obj.n.at(i));
                }


            return x; //return object
        }

};
int main()
{
    NUM num1,num2,sum;
    num1.getNum({10});
    num2.getNum({20});

    //add two objects
    sum=num1+num2;

   sum.dispNum();

    cout << endl;
    return 0;
}