当我编译以下代码时，由于某种原因，学生/教师的姓名，年龄和GPA /等级不会通过各自的printPerson函数返回。
使用名称变量，不会向控制台打印任何内容。 随着年龄，GPA /评级，控制台打印出负8位数字和负浮动。
我没看到什么？
Person.h
#pragma once
#ifndef PERSON_H
#define PERSON_H
#include <iostream>
#include <vector>
#include <string>
using std::string;
// Base class
class Person {
protected:
string name;
int age;
public:
void setName(string name);
void setAge(int age);
virtual void do_work(int number) {};
virtual void printPerson() {};
};
#endif;
Person.cpp
#include "Person.h"
#include <iostream>
#include <vector>
#include <string>
using std::cout;
using std::cin;
using std::endl;
void Person::setName(string name) {
name = name;
}
void Person::setAge(int age) {
age = age;
}
Student.h
#pragma once
#ifndef STUDENT_H
#define STUDENT_H
#include <iostream>
#include <vector>
#include <string>
#include "Person.h"
using std::string;
class Student : public Person {
private:
float gpa;
public:
void setGPA(float gpa);
float getGPA();
void do_work(int number);
void printPerson();
};
#endif;
Student.cpp
#include "Student.h"
#include <iostream>
#include <vector>
#include <string>
using std::string;
using std::cout;
using std::cin;
using std::endl;
void Student::setGPA(float gpa) {
gpa = gpa;
}
float Student::getGPA() {
return gpa;
}
void Student::do_work(int number) {
//cout << name << ".. " << number << "hours of homework.” << endl;
cout << name;
}
void Student::printPerson() {
cout << "Name : " << name << "Age :" << age << " GPA : " << getGPA() << endl;
}
Instructor.h
#pragma once
#ifndef INSTRUCTOR_H
#define INSTRUCTOR_H
#include <iostream>
#include <vector>
#include <string>
#include "Person.h"
class Instructor : public Person {
private:
float rating;
public:
void setRating(float rating);
float getRating();
void do_work(int number);
void printPerson();
};
#endif;
Instructor.cpp
#include "Instructor.h"
#include <iostream>
#include <vector>
#include <string>
using std::string;
using std::cout;
using std::cin;
using std::endl;
void Instructor::setRating(float rating) {
rating = rating;
}
float Instructor::getRating() {
return rating;
}
void Instructor::do_work(int number) {
cout << name << "graded papers for" << number << "hours." << endl;
}
void Instructor::printPerson() {
cout << " Name : " << name << " Age : " << age << " Rating : " << getRating() << endl;
}
University.h
#pragma once
#ifndef UNIVERSITY_H
#define UNIVERSITY_H
#include <iostream>
#include <vector>
#include <string>
#include "Person.h"
#include "Building.h"
#include "Student.h"
using std::cout;
using std::string;
using std::vector;
class University {
public:
string name;
vector<Person*> persons;
vector<Building> buildings;
public:
void printAllBuildings();
void printAllPersonsRecord();
};
#endif;
University.cpp
#include "University.h"
#include <iostream>
#include <vector>
#include <string>
using std::string;
using std::cout;
using std::cin;
using std::endl;
void University::printAllBuildings() {
cout << " Building Details : " << endl;
for (int j = 0; j < buildings.size(); j++) {
buildings[j].printBuilding();
}
}
void University::printAllPersonsRecord() {
cout << " Persons Details : " << endl;
for (int i = 0; i < persons.size(); i++) {
persons[i]->printPerson();
}
}
Building.h
#pragma once
#ifndef BUILDING_H
#define BUILDING_H
#include <iostream>
#include <vector>
#include <string>
#include "Person.h"
class Building {
public:
string name;
int size;
string address;
public:
void printBuilding();
};
#endif;
Building.cpp
#include "Building.h"
#include <iostream>
#include <vector>
#include <string>
using std::string;
using std::cout;
using std::cin;
using std::endl;
void Building::printBuilding() {
cout << " Name : " << name << " Address : " << address << endl;
}
的main.cpp
#include "University.h"
#include "Person.h"
#include "Student.h"
#include "Instructor.h"
#include <iostream>
#include <vector>
#include <string>
using std::string;
using std::cout;
using std::cin;
using std::endl;
int main() {
Student student;
Instructor instructor;
student.setName("deepak");
student.setAge(12);
student.setGPA(12.0);
instructor.setName("rajdev");
instructor.setAge(23);
instructor.setRating(5.0);
Building building;
building.name = "block1";
building.size = 2000;
building.address = "noida sector-2";
Building building2;
building2.name = "block2";
building2.size = 4000;
building2.address = "noida sector-2";
University university;
university.name = "Oregon State University";
university.persons.emplace_back(&student);
university.persons.emplace_back(&instructor);
university.buildings.push_back(building);
university.buildings.push_back(building2);
university.printAllBuildings();
university.printAllPersonsRecord();
int choice;
bool isValidMainChoice = false;
while (!isValidMainChoice) {
cout << "Kindly choose one of the option from follwoing list of operations or Menu" << endl;
cout << "1 : Prints names of all the buildings" << endl;
cout << "2 : Prints names of everybody at the university" << endl;
cout << "3 : Choose a person to do work" << endl;
cout << "4 : Exit the program" << endl;
cin >> choice;
cout << "The value you entered is " << choice << endl;
if (choice == 1) {
university.printAllBuildings();
}
else if (choice == 2) {
university.printAllPersonsRecord();
}
else if (choice == 3) {
int personChoice;
bool isInputValid = false;
while (!isInputValid) {
cout << "Kindly choose the one of the following option to provide person's details." << endl;
cout << "5 : Student" << endl;
cout << "6 : Instructor" << endl;
cin >> personChoice;
if (personChoice == 5) {
isInputValid = true;
string studentName;
bool isValidName = false;
while (!isValidName) {
cout << " Kindly enter Name of the student :" << endl;
cin >> studentName;
if (studentName.length() == 0) {
cout << " Name must not be blank. Kindly re-enter the student's name." << endl;
}
else {
isValidName = true;
}
}
int age1 = 0;
bool isValidAge1 = false;
while (!isValidAge1) {
cout << " Kindly enter age of the student :" << endl;
cin >> age1;
if (age1 < 0 || age1 > 100) {
cout << " Age must be geter than 0 or lessa then 100. Kindly re-enter the student's age." << endl;
}
else {
isValidAge1 = true;
}
}
float gpa;
bool isValidGPA = false;
while (!isValidGPA) {
cout << " Kindly enter GPA of the student :" << endl;
cin >> gpa;
if (gpa < 0.0 || gpa > 4.0) {
cout << " GPA must be geter than 0.0 or less then 4.0. Kindly re-enter the Student GPA." << endl;
isValidGPA = false;
}
else {
isValidGPA = true;
}
}
Student student;
student.setName(studentName);
student.setAge(age1);
student.setGPA(gpa);
university.persons.emplace_back(&student);
university.printAllPersonsRecord();
}
else if (personChoice == 6) {
isInputValid = true;
string instructorName;
bool isValidName = false;
while (!isValidName) {
cout << " Kindly enter Name of the instructor :" << endl;
cin >> instructorName;
if (instructorName.length() == 0) {
cout << " Name must not be blank. Kindly re-enter the instructor's name." << endl;
}
else {
isValidName = true;
}
}
float rating;
bool isValidRating = false;
while (!isValidRating) {
cout << " Kindly enter rating of the instructor :" << endl;
cin >> rating;
if (rating < 0.0 || rating > 5.5) {
cout << " rating must be geter than 0.0 or less then 5.5. Kindly re-enter the instructor rating." << endl;
isValidRating = false;
}
else {
isValidRating = true;
}
}
int age2 = 0;
bool isValidAge2 = false;
while (!isValidAge2) {
cout << " Kindly enter age of the instructor :" << endl;
cin >> age2;
if (age2 < 0 || age2 > 100) {
cout << " Age must be geter than 0 or lessa then 100. Kindly re-enter the instructor's age." << endl;
}
else {
isValidAge2 = true;
}
}
Instructor instructor;
instructor.setName(instructorName);
instructor.setAge(age2);
instructor.setRating(rating);
university.persons.emplace_back(&instructor);
}
else {
cout << "The value you entered is incorrct.Please r-enter the values." << endl;
}
}
}
else if (choice == 4) {
isValidMainChoice = true;
cout << " You are exits from system. Thanks You !!" << endl;
}
}
return 0;
};
答案 0 :(得分：1)
请修改 setter
的所有代码void Person::setName(string name) {
//before-edit: name = name;
this->name = name; //OR Person::name = name;
}
由于本地字符串 名称 参数和您的类变量相同，您希望参数正确传递，但它不会。