Question

我不能为我的生活理解为什么这不显示每个课程的课程信息。我一直在努力，因为我昨晚在这里询问另一件事。我不知道该做什么或为什么它不起作用，当它显示信息时它只显示它为第二类

#include "stdafx.h"
#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<cstdlib>
using namespace std;

struct Classroom{
int Studn;
int Studn1;
int RoomNum;
string lname;
string StudList;
int Chairs;
bool window;
bool projector;
bool availability;
};
void classinfo1(Classroom& clss, vector<string> Stud);
void output(Classroom& clss, vector<string> Stud);
void classinfo2(Classroom & clss1, vector<string> Stud1);
void output1(Classroom & clss1, vector<string> Stud1);


int main()
 {
vector<string> test;
vector<string> test1;
Classroom now;
Classroom now1;
float a, b;


classinfo1(now,test);
classinfo2(now, test);
output(now,test);
output1(now, test);



system("pause");
return 0;
 }

 void classinfo1(Classroom& clss, vector<string> Stud){


string answer;



cout << "Please enter the first classrooms info\n";
cout << "Room number\n";
cin >> clss.RoomNum;
cout << "Lecture name\n";
cin >> clss.lname;
cout << "number of chairs in the class\n";
cin >> clss.Chairs;
cout << "How many students is in your class?\n";
cin >> clss.Studn;

for (int i = 0; i < clss.Studn; i++){
    cout << "enter student " << i + 1 << endl;
    cin >> clss.StudList;

    Stud.push_back(clss.StudList);

}
cout << "Does the class have a window?" << endl;
cin >> answer;
if (answer == "Yes" || answer == "yes" || answer == "YES"){
    clss.window = true;
}
if (answer == "no" || answer == "No" || answer == "NO"){
    clss.window = false;
}
cout << "is the class available?" << endl;
cin >> answer;
if (answer == "Yes" || answer == "yes" || answer == "YES"){
    clss.availability = true;
}
if (answer == "no" || answer == "No" || answer == "NO"){
    clss.availability = false;
}
cout << "does it have a projector?" << endl;
cin >> answer;
if (answer == "Yes" || answer == "yes" || answer == "YES"){
    clss.projector = true;
}
if (answer == "no" || answer == "No" || answer == "NO"){
    clss.projector = false;
}



 system("cls");
 }

 void output(Classroom& clss, vector<string> Stud){


cout << "\n\n\n";
cout << "Class one info\n";
cout << "Room number:" << clss.RoomNum << endl;
cout << "Lecture Name:" << clss.lname << endl;
cout << "Num of Chairs:" << clss.Chairs << endl;
cout << "Num of Students:" << clss.Studn << endl;
cout << "Student names:" << endl;

vector<string>::iterator studorder;

sort(Stud.begin(), Stud.end());
for (studorder = Stud.begin(); studorder < Stud.end(); ++studorder){
    cout << *studorder << endl;
}
if (clss.window){
    cout << "window : yes" << endl;
}
else{
    cout << "window: no\n";
}
if (clss.availability){
    cout << "availability : yes" << endl;
}
else{
    cout << "availability : no\n";
}
if (clss.projector){
    cout << "projector : yes" << endl;
}
else{
    cout << "projector : no\n";
}
 }

void classinfo2(Classroom & clss1, vector<string> Stud1){

string answer1;



cout << "Please enter the second classrooms info\n";
cout << "Room number\n";
cin >> clss1.RoomNum;
cout << "Lecture name\n";
cin >> clss1.lname;
cout << "number of chairs in the class\n";
cin >> clss1.Chairs;
cout << "How many students is in your class?\n";
cin >> clss1.Studn;

for (int i = 0; i < clss1.Studn; i++){
    cout << "enter student " << i + 1 << endl;
    cin >> clss1.StudList;

    Stud1.push_back(clss1.StudList);

}
cout << "Does the class have a window?" << endl;
cin >> answer1;
if (answer1 == "Yes" || answer1 == "yes" || answer1 == "YES"){
    clss1.window = true;
}
if (answer1 == "no" || answer1 == "No" || answer1 == "NO"){
    clss1.window = false;
}
cout << "is the class available?" << endl;
cin >> answer1;
if (answer1 == "Yes" || answer1 == "yes" || answer1 == "YES"){
    clss1.availability = true;
}
if (answer1 == "no" || answer1 == "No" || answer1 == "NO"){
    clss1.availability = false;
}
cout << "does it have a projector?" << endl;
cin >> answer1;
if (answer1 == "Yes" || answer1 == "yes" || answer1 == "YES"){
    clss1.projector = true;
}
if (answer1 == "no" || answer1 == "No" || answer1 == "NO"){
    clss1.projector = false;
}



}

 void output1(Classroom & clss1, vector<string> Stud1){


cout << "\n\n\n";
cout << "Class Two info\n";
cout << "Room number:" << clss1.RoomNum << endl;
cout << "Lecture Name:" << clss1.lname << endl;
cout << "Num of Chairs:" << clss1.Chairs << endl;
cout << "Num of Students:" << clss1.Studn << endl;
cout << "Student names:" << endl;

vector<string>::iterator studorder1;

sort(Stud1.begin(), Stud1.end());
for (studorder1 = Stud1.begin(); studorder1 < Stud1.end(); ++studorder1){
    cout << *studorder1 << endl;
}
if (clss1.window){
    cout << "window : yes" << endl;
}
else{
    cout << "window: no\n";
}
if (clss1.availability){
    cout << "availability : yes" << endl;
}
else{
    cout << "availability : no\n";
}
if (clss1.projector){
    cout << "projector : yes" << endl;
}
else{
    cout << "projector : no\n";
}
}

Answer 1

void classinfo1(Classroom& clss, vector<string> Stud){

按值传递Stud。换句话说，它会传递Stud的副本，该副本仅在classinfo1内可用。调用代码中的向量不受影响。

如果要编辑调用者的向量，则应该通过引用传递

void classinfo1(Classroom& clss, vector<string>& Stud){
//                                             ^

同样适用于classinfo2。你可能也应该将你的第二个向量 - test1传递给它。您当前将相同的向量传递给两个函数，这意味着两个类的详细信息将合并为一个数组。

classinfo2(now, test1);

Answer 2

您必须通过引用函数classinfo1和classinfo2

来传递向量

void classinfo1(Classroom& clss, vector<string> &Stud);
void classinfo2(Classroom & clss1, vector<string> &Stud1);

考虑到在结构StudList中定义数据成员Classroom没有任何意义，因为它总是在代码片段中的函数classinfo1和classinfo2中被覆盖

for (int i = 0; i < clss.Studn; i++){
    cout << "enter student " << i + 1 << endl;
    cin >> clss.StudList;

    Stud.push_back(clss.StudList);

}

如果你从结构中删除这个数据成员并在上面显示的循环中使用std :: string类型的局部变量会更好。

C ++未显示输入的第二组信息

2 个答案: