我可以输入输入，但是当我在 visual studio 2017 年 运行 我的 C++ 代码 (CTRL+F5) 时，我无法看到输出

Question

I can enter the inputs but I'm not able to see the output when I run my code (CTRL+F5) in C++ in visual studio 2017. This code is written to overload the operator *, ">>" & "<<" through the friend functions. one constructor initializes the vector elements to zero while the other constructor is used to initialize the elements of vector through the array.

我的代码如下：

 //vector.h

#pragma once
const int SIZE = 3;
#include<iostream>
using namespace std;
class vector
{
    int v[SIZE];
public:
    vector();
    vector(int *x);
    friend vector operator *(vector a, int b);
    friend vector operator *(int b,vector a);
    friend istream & operator >>(istream &input, vector &x);
    friend ostream & operator <<(ostream &output, vector &y);

};

    //vector.cpp

#include "vector.h"
#include<iostream>
using namespace std;



vector::vector()
{
    for (int i = 0; i < SIZE; i++)
        v[i] = 0;

}
vector::vector(int *x)
{
    for (int i = 0; i < SIZE; i++)
        v[i] = x[i];

}
vector operator *(vector a, int b) {
    vector temp;
    for (int i = 0; i < SIZE; i++)
        temp.v[i] = a.v[i]*b;
    return temp;


}
vector operator *(int a, vector b) {
    vector temp;
    for (int i = 0; i < SIZE; i++)
        temp.v[i] = a * b.v[i];
    return temp;
}
istream & operator >>(istream &input, vector &x) {
    for (int i = 0; i < SIZE; i++)
        input >> x.v[i];
    return (input);


}
ostream & operator <<(ostream &output, vector &y) {
    output << "(" << y.v[0];
    for (int i = 1; i < SIZE; i++)
        output <<","<< y.v[i];
    output << ")";
    return (output);

}

    //main.cpp

#include "vector.h"
#include<iostream>
using namespace std;
int x[SIZE] = { 2,4,6 };
int main() {

    vector m;   
    vector v2 = x;
    cout << "Enter the elements of vector m:" << "\n";
    cin >> m;
    cout << "\n";
    vector m1, m2;
    m1 = m * 2;
    m2 = 2 * v2;
    cout << "m= "<<m<<"\n"; 
    cout << "\n";
    cout << "m1= " << m1 << "\n";
    cout << "m2= " << m2 << "\n";
    cin.get();

    return 0;


}

Answer 1

您的代码假定您必须输入 3 个数字。如果输入的数字较少，则看不到任何输出。

一些评论：

您的 cin.get() 不会停止执行。 使用 std（就像使用命名空间 std）和定义自己的向量 class - 这是非常糟糕的主意。

Answer 2

可能是您的链接器设置不正确。转到菜单项 Project/Properties。然后在对话框中找到 Configuration Properties/Linker/System/Subsystem 并确保它显示 Console (/SUBSYSTEM:CONSOLE).

Evgeny 是正确的 cin.get() 不能保证停止您的程序，因为仍然有字符等待从 cin 中读取，这些字符是以前读取时遗留下来的。