I'm working on a project for school, and after finishing and testing it, I separated it into a file containing my functions, the main function, and a header file. Both the functions and the header compile fine, but when I compile the main, I get the error which is included at the bottom of this post
Here is the main file:
#include "header.h"
using namespace std;
int main()
{
bool exit = false;
int idIn;
//header
//creates enumerator for menu
enum CHOICE {add=1, remove=2, display=3, search=4, results=5, quit=6};
int input;
//outputs menu
//switch case for input
while (!exit)
{
cout << "1: Add" << endl;
cout << "2: Remove" << endl;
cout << "3: Display" << endl;
cout << "4: Search" << endl;
cout << "5: Results" << endl;
cout << "6: Quit" << endl;
cout << "Enter choice: ";
cin >> input;
switch (input)
{
case add:
add_student();
break;
case remove:
cout << "Enter the id for the student to remove: ";
cin >> idIn;
remove_student(idIn);
if(!removed)
{
cout << "Student does not exist" << endl;
}
break;
case display:
//naming the function "Display" causes a compile error
student_display();
break;
case search:
//naming the function "search" causes a compile error
cout << "Enter the id for the student to search for: ";
cin >> idIn;
student_search(idIn);
if(!found)
{
cout << "Student does not exist" << endl;
}
break;
case results:
exportResults();
cout << "Results exported to file: averages.dat" << endl;
break;
case quit:
cout << "Bye" << endl;
exit = true;
break;
default:
cout << "INVALID ENTRY" << endl;
break;
}
}
return 0;
}
Here is the function file:
#include "header.h"
using namespace std;
int getNumber()
{
ifstream fin;
fin.open("student.dat");
if (fin.fail())
{
cout<<"File error."<<endl;
exit(1);
}
int count=0;
string line;
while(!fin.eof())
{
getline(fin, line);
++count;
}
fin.close();
return(count);
}
int findMinimum(int grades[], int numgrades)
{
int minimum = grades[0];
for(int i = 0; i < numgrades; i++)
{
if (grades[i] < minimum)
{
minimum = grades[i];
}
}
return minimum;
}
void add_student()
{
studentFile.open("student.dat", ios_base::app);
if (studentFile.fail())
{
cout<<"File error."<<endl;
exit(1);
}
//declarations
string first;
string last;
student newstudent;
int input;
//input student info
cin.ignore();
cout << "Last name: ";
getline(cin, last);
cout << "First name: ";
getline(cin,first);
newstudent.name = last + "," + first;
cout << "Enter the students id number: ";
cin >> newstudent.id;
cout << "Enter the number of tests taken: ";
cin >> newstudent.numTests;
//inputs testgrades for student
newstudent.tests = new int[newstudent.numTests];
for(int i = 0; i < newstudent.numTests; i++)
{
cout << "Enter test grade " << i+1 << ": ";
cin >> newstudent.tests[i];
}
//write student info to file
studentFile << newstudent.name << "," << newstudent.id <<","<< newstudent.numTests << ",";
//write test grades to file
for(int i = 0; i < newstudent.numTests; i++)
{
studentFile << newstudent.tests[i] << ",";
}
studentFile << endl;
//closes student file
studentFile.close();
delete [] newstudent.tests;
}
void remove_student(int id)
{
int numstudents = getNumber();
removed = false;
string intIn;
string input;
string first;
string last;
//creates dynamic array of students
student *students;
students = new student[numstudents];
//opens students.dat file
readFile.open("student.dat");
if (readFile.fail())
{
cout<<"File error."<<endl;
exit(1);
}
//cout << "Searching " << numstudents << " students" << endl;
//scan in student list
for(int i = 0; i < numstudents; i++)
{
student newstudent;
getline(readFile,input);
stringstream ss (input);
getline(ss, first, ',');
getline(ss, last, ',');
newstudent.name = first + "," + last;
getline(ss, intIn, ',');
newstudent.id = stoi(intIn);
getline(ss, intIn, ',');
newstudent.numTests = stoi(intIn);
newstudent.tests = new int[newstudent.numTests];
for(int j = 0; j < newstudent.numTests; j++)
{
getline(ss, intIn, ',');
newstudent.tests[j] = stoi(intIn);
}
students[i] = newstudent;
}
readFile.close();
studentFile.open("student.dat");
if (readFile.fail())
{
//cout<<"File error on open."<<endl;
//exit(1);
}
for(int i = 0; i < numstudents - 1; i++)
{
student out;
out = students[i];
if(out.id!=id)
{
studentFile << out.name << "," << out.id << "," << out.numTests << ",";
for(int j = 0; j < out.numTests; j++)
{
studentFile << out.tests[j] << ",";
}
studentFile << endl;
}
else
{
removed = true;
}
}
//delete student array
delete [] students;
//close open files
studentFile.close();
}
void student_display()
{
int numstudents = getNumber();
string intIn;
string input;
string first;
string last;
readFile.open("student.dat");
if (readFile.fail())
{
cout<<"File error."<<endl;
exit(1);
}
for(int i = 0; i < numstudents - 1; i++)
{
student printStudent;
getline(readFile,input);
stringstream ss (input);
getline(ss, first, ',');
getline(ss, last, ',');
printStudent.name = first + "," + last;
cout << setw(30) << printStudent.name;
getline(ss, intIn, ',');
printStudent.id = stoi(intIn);
cout << setw(15) << printStudent.id;
getline(ss, intIn, ',');
printStudent.numTests = stoi(intIn);
printStudent.tests = new int[printStudent.numTests];
for(int j = 0; j < printStudent.numTests; j++)
{
getline(ss, intIn, ',');
printStudent.tests[j] = stoi(intIn);
cout << setw(5) << printStudent.tests[j];
}
//students[i] = printStudent;
cout << endl;
delete [] printStudent.tests;
}
readFile.close();
}
void student_search(int id)
{
int numstudents = getNumber();
string intIn;
string input;
string first;
string last;
found = false;
readFile.open("student.dat");
if (readFile.fail())
{
cout<<"File error."<<endl;
exit(1);
}
for(int i = 0; i < numstudents - 1; i++)
{
student printStudent;
getline(readFile,input);
stringstream ss (input);
getline(ss, first, ',');
getline(ss, last, ',');
printStudent.name = first + "," + last;
getline(ss, intIn, ',');
printStudent.id = stoi(intIn);
if(printStudent.id == id)
{
cout << printStudent.name;
cout << setw(15) << printStudent.id;
getline(ss, intIn, ',');
printStudent.numTests = stoi(intIn);
printStudent.tests = new int[printStudent.numTests];
for(int j = 0; j < printStudent.numTests; j++)
{
getline(ss, intIn, ',');
printStudent.tests[j] = stoi(intIn);
cout << setw(5) << printStudent.tests[j];
}
//students[i] = printStudent;
cout << endl;
delete [] printStudent.tests;
found = true;
}
}
readFile.close();
}
void exportResults()
{
//decarations.
int numStudents = getNumber();
double average;
double min;
double sum;
int calcTests;
string intIn;
string input;
string first;
string last;
//opens export file
expFile.open("averages.dat");
if(readFile.fail())
{
cout << "File error" << endl;
exit(1);
}
//opens read file
readFile.open("student.dat");
if (readFile.fail())
{
cout<<"File error."<<endl;
exit(1);
}
//scans student file and copys ids and average grade to the export file
for(int i = 0; i < numStudents - 1; i++)
{
//sets values
sum = 0;
min = 0;
//reads student info from file
student printStudent;
//sets up string stream
getline(readFile,input);
stringstream ss (input);
//gets name (not saved here)
getline(ss, first, ',');
getline(ss, last, ',');
printStudent.name = first + "," + last;
//reads and prints id to exp file
getline(ss, intIn, ',');
printStudent.id = stoi(intIn);
expFile << printStudent.id;
//gets number of tests
getline(ss, intIn, ',');
printStudent.numTests = stoi(intIn);
calcTests = printStudent.numTests;
//copys grades to new array for the find minimum function
int grades[printStudent.numTests];
for(int j = 0; j < printStudent.numTests; j++)
{
getline(ss, intIn, ',');
grades[j] = stoi(intIn);
//ads grade to sum
sum += grades[j];
}
//gets minimum from getminimum function
min = findMinimum(grades, calcTests);
//drop lowest test grade;
sum -= min;
//calc average
average = sum/(printStudent.numTests-1);
//print grade
expFile << setprecision(1) << fixed << setw(7) << average << endl;
}
//closes files
readFile.close();
expFile.close();
}
Here is the header file:
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <iomanip>
using namespace std;
const int TESTS = 5;
ofstream studentFile;
ifstream readFile;
ofstream expFile;
bool removed;
bool found;
struct student
{
string name;
int numTests;
int id;
int *tests;
double averageScore;
};
int getNumber();
int findMinimum(int, int);
void add_student();
void remove_student(int);
void student_display();
void student_search(int);
void exportResults();
//int main();
When I compile the main function, I get the following error:
g++ Project2_main.cpp
/tmp/ccKi3gpQ.o: In function `.L4':
cwh0114Project2_main.cpp:(.text+0x26a): undefined reference to `add_student()'
/tmp/ccKi3gpQ.o: In function `.L6':
cwh0114Project2_main.cpp:(.text+0x2aa): undefined reference to `remove_student(int)'
/tmp/ccKi3gpQ.o: In function `.L7':
cwh0114Project2_main.cpp:(.text+0x2f7): undefined reference to `student_display()'
/tmp/ccKi3gpQ.o: In function `.L8':
cwh0114Project2_main.cpp:(.text+0x337): undefined reference to `student_search(int)'
/tmp/ccKi3gpQ.o: In function `.L9':
cwh0114Project2_main.cpp:(.text+0x384): undefined reference to `exportResults()'
collect2: error: ld returned 1 exit status
