Need help fixing my add function. For some reason, it takes 2 inputs.

college.cpp

#include

#include

#include "college.hpp"

#include "course.hpp"

#include "node.hpp"

using namespace std;

College::~College(){

for(node* del = head; del != NULL; del = del->link()){

delete del;

}

head = NULL;

}

College::College(const College& o){

head = NULL;

node *new_head = o.head;

node *last = NULL;

while(new_head != NULL){

node *next = new node;

next->set_data(new_head->data());

next->set_link(NULL);

if(last != NULL){

last->set_link(next);

}

else{

head = new_head;

}

last = new_head;

new_head = new_head->link();

}

}

College College::operator =(const College& o){

if(this == &o){

return *this;

}

else{

delete head;

node *new_head = o.head;

node *last = NULL;

head = NULL;

while(new_head != NULL){

if(last == NULL){

head = new node;

head->set_data(new_head->data());

head->set_link(NULL);

last = head;

}

else{

last->set_link(new node);

last = last->link();

last->set_data(new_head->data());

last->set_link(NULL);

}

new_head = new_head->link();

}

return *this;

}

}

void College::add(course c){

cout << "Enter course information: " << endl;

cin >> c;

node* tmp;

if(head == NULL){

head = new node;

head->set_data(c);

head->set_link(NULL);

}

else{

for(tmp = head; tmp != NULL; tmp = tmp->link()){

tmp->set_link(new node);

tmp = tmp->link();

tmp->set_data(c);

tmp->set_link(NULL);

}

}

}

void College::remove(const std::string& n){

node* cursor = head;

node* rmptr;

if (cursor->data().get_course_number() == n){

rmptr = head;

head = head->link();

delete rmptr;

return;

}

while (cursor->link() != NULL && cursor->link()->data().get_course_number() != n){

(cursor = cursor->link());

}

if (cursor->link()->data().get_course_number() == n) {

rmptr = cursor->link();

cursor->set_link(cursor->link()->link());

delete rmptr;

return;

}

}

void College::display(ostream& ofs){

for(node* tmp = head; tmp != NULL; tmp = tmp->link()){

cout << tmp->data() << endl;

}

}

double College::hours()const{

course c;

int total_hours = 0;

for(node* tmp = head; tmp != NULL; tmp = tmp->link()){

total_hours += c.get_hours();

}

return total_hours;

}

double College::gpa()const{

course c;

double grade_pts = 0.0;

double GPA = 0.0;

for(node* tmp = head; tmp != NULL; tmp = tmp->link()){

grade_pts += c.get_number_grade() * c.get_hours();

}

GPA = (grade_pts / c.get_hours());

return GPA;

}

void College::load(istream& ins){

course tmp;

while(ins >> tmp){

add(tmp);

}

}

void College::save(ostream& outs){

for(node* tmp = head; tmp != NULL; tmp = tmp->link()){

outs << tmp->data() << endl;

}

}

college.hpp

#ifndef college_hpp

#define college_hpp

#include

#include

#include "course.hpp"

#include "node.hpp"

class College {

public:

typedef course value_type;

College() {name = "defaultname"; head = NULL;}

College(std::string n) {n = name; head = NULL;}

~College();

College(const College& o);

College operator =(const College& o);

void add(course c);

void remove(const std::string& n);

void display(std::ostream& ofs);

void load(std::istream& ins);

void save(std::ostream& outs);

void set_name(std::string n);

double hours()const;

double gpa()const;

private:

std::string name;

node *head;

};

#endif