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私はPersonとStudentの2つのクラスを持っています。私は現在、PersonクラスからStudentクラスを派生しようとしています。リンクエラーC++継承
ただし、リンクエラーが発生しています。
エラー：
[Linker error] undefined reference to `Person::Person()'
マイコード：
#include <iostream>
#include <iomanip>
using namespace std;
class Person {
string Name ;
public:
Person(void);
void set(){
cout << "Name:" << endl ;
cin >> Name ;
}
string get_Name(){
return Name ;
}
};
class Student:Person {
int x, Lab1, Lab2, Lab3, Lab4, Lab5, Lab6, LabPoints, Midterm, Final ;
float LabAvg, ExamAvg, Prcnt ;
string StuName ;
public:
Student(void);
void set(int i){
x = i;
cout << "Student " << x << endl << endl ;
cout << "Name:" << endl ;
cin >> StuName ;
cout << "Lab 1 score (1-10): " << endl ;
cin >> Lab1 ;
cout << "Lab 2 score (1-10): " << endl ;
cin >> Lab2 ;
cout << "Lab 3 score (1-10): " << endl ;
cin >> Lab3 ;
cout << "Lab 4 score (1-10): " << endl ;
cin >> Lab4 ;
cout << "Lab 5 score (1-10): " << endl ;
cin >> Lab5 ;
cout << "Lab 6 score (1-10): " << endl ;
cin >> Lab6 ;
cout << "Midterm score (1-100): " << endl ;
cin >> Midterm ;
cout << "Final score (1-100): " << endl ;
cin >> Final ;
LabAvg = (Lab1 + Lab2)/2.0 ;
LabPoints = (Lab1 + Lab2) ;
ExamAvg = (Midterm + Final)/2.0 ;
Prcnt = (((LabPoints/60.0) * 0.6) + ((Midterm/100.0) * 0.2) +
((Final/100.0) * 0.2)) * 100 ;
}
string get_StuName(){
return StuName ;
}
int get_Lab1(){
return Lab1 ;
}
int get_Lab2(){
return Lab2 ;
}
int get_Lab3(){
return Lab3 ;
}
int get_Lab4(){
return Lab4 ;
}
int get_Lab5(){
return Lab5 ;
}
int get_Lab6(){
return Lab6 ;
}
float get_LabAvg(){
return LabAvg ;
}
int get_LabPoints(){
return LabPoints ;
}
float get_ExamAvg(){
return ExamAvg ;
}
float get_Prcnt(){
return Prcnt ;
}
};
Student::Student(void){
x = 0, Lab1 = 0, Lab2 = 0, Lab3 = 0, Lab4 = 0, Lab5 = 0, Lab6 = 0,
LabPoints = 0, Midterm = 0, Final = 0 ;
LabAvg = 0.0, ExamAvg = 0.0, Prcnt = 0.0 ;
StuName = "" ;
}
int main(){
int MaxNumStu = 10, NumOfRep , i ;
float FPrcnt ;
string LetGrd ;
cout << "Number of Students:" << endl ;
cin >> NumOfRep ;
cout << endl << endl ;
Student obs[MaxNumStu] ;
NumOfRep = ++NumOfRep ;
for(i=1 ; i < NumOfRep ; i++)
obs[i].set(i) ;
cout << endl << "---------------------------------" << endl << endl ;
for(i=1; i < NumOfRep; i++){
cout << obs[i].get_StuName() << endl << endl;
cout << "Lab 1 Score: " << obs[i].get_Lab1() << endl ;
cout << "Lab 2 Score: " << obs[i].get_Lab2() << endl ;
cout << "Lab 3 Score: " << obs[i].get_Lab3() << endl ;
cout << "Lab 4 Score: " << obs[i].get_Lab4() << endl ;
cout << "Lab 5 Score: " << obs[i].get_Lab5() << endl ;
cout << "Lab 6 Score: " << obs[i].get_Lab6() << endl ;
cout << endl << "Average Lab Score: " << setprecision(4) <<
obs[i].get_LabAvg() << endl ;
cout << "Total Lab Points: " << obs[i].get_LabPoints() << endl ;
cout << endl << "Average Exam Score: " << setprecision(4) <<
obs[i].get_ExamAvg() << endl ;
FPrcnt = obs[i].get_Prcnt() ;
if (FPrcnt >= 90)
LetGrd = "% A" ;
if (FPrcnt >= 80)
if (FPrcnt < 90)
LetGrd = "% B" ;
if (FPrcnt >= 70)
if (FPrcnt < 80)
LetGrd = "% C" ;
if (FPrcnt >= 60)
if (FPrcnt < 70)
LetGrd = "% D" ;
if (FPrcnt < 60)
LetGrd = "% F";
cout << endl << endl << "Overall Grade: " << setprecision(3) << FPrcnt
<< LetGrd << endl;
cout << endl << endl ;
}
system("pause") ;
}