Suggestions with creating a Menu for Patient Program in C++ - c++

Question

So I've basically have most of the programming almost complete. I wanted to add a menu that displays an output. For example, a list of records is created. After it is all entered, I would like for it to display only the patients that smoke or have high blood pressure or high fat diet when selecting a number from the menu. Now I am stuck trying to figure that out but can't seem to wrap my head around it. Any suggestions of how I can get it work? Right now it is only set to display all of the records at once.
//Program Description: An interface program that displays patients records.
#include <iostream>
#include <string>
using namespace std;
struct Node
{
char name[20];
int age;
string smoker;
string hbp;
string hfd;
int points;
Node *ptr;
};
Node *startPtr = NULL;
void getInfo()
{
Node *p, *p2;
p = new Node;
int agePoints;
int smkPoints;
int hbpPoints;
int hfdPoints;
cout << " Please enter the name of the patient : ";
cin >> p->name;
cout << " Please enter the age of the patient : ";
cin >> p->age;
cout << " Is he/she a smoker (y/n) : ";
cin >> p->smoker;
cout << " Does he/she have high blood pressure? (y/n) : ";
cin >> p->hbp;
cout << " Does he/she have a high fat diet? (y/n) : ";
cin >> p->hfd;
cout << endl;
p->ptr = NULL;
// Age point system
if (p-> age > 30) {
agePoints = 3;
}
else if (p->age > 20)
{
agePoints = 2;
}
else
{
agePoints = 1;
}
// Habits Points System
if (p->smoker == "Y" || p->smoker == "y")
{
p->smoker = "Yes";
smkPoints = 4;
}
else
{
p->smoker = "non smoker";
smkPoints = 0;
}
if (p->hbp == "Y" || p->hbp == "y")
{
p->hbp = "High blood pressure";
hbpPoints = 2;
}
else
{
p->hbp = "Normal blood pressure";
hbpPoints = 0;
}
if (p->hfd == "Y" || p->hfd == "y")
{
p->hfd = "High fat diet";
hfdPoints = 1;
}
else
{
p->hfd = "Low fat diet";
hfdPoints = 0;
}
p->points = agePoints + smkPoints + hbpPoints + hfdPoints;
// Set up link to this node
if (startPtr == NULL) {
startPtr = p;
}
else
{
p2 = startPtr;
while (p2->ptr != NULL)
p2 = p2->ptr;
p2->ptr = p;
}
}
void delete_start_node()
{
Node *p;
p = startPtr;
startPtr = startPtr->ptr;
delete p;
}
void delete_end_node()
{
Node *p1, *p2;
if (startPtr == NULL)
cout << "The List is empty!\n";
else
{
p1 = startPtr;
if (p1->ptr == NULL)
{
delete p1;
startPtr = NULL;
}
else
{
while (p1->ptr != NULL)
{
p2 = p1;
p1 = p1->ptr;
}
delete p1;
p1->ptr = NULL;
}
}
}
void disp()
{
Node *p;
p = startPtr;
if (p == NULL)
cout << "Empty List!\n";
while (p != NULL)
{
if (p == NULL)
cout << "Empty List!\n";
cout << " Name : " << p->name << endl;
cout << " Age : " << p->age << endl;
cout << " Smoker : " << p->smoker << endl;
cout << " Blood Pressure : " << p->hbp << endl;
cout << " Fat Diet : " << p->hfd << endl;
cout << " Points : " << p->points << endl;
cout << endl;
p = p->ptr;
}
}
Node* removeptr(Node* prev)
{
if (prev)
{
if (prev->ptr)
{
Node* p = prev->ptr;
prev->ptr = p->ptr;
return p;
}
}
else if (startPtr)
{
Node* p = startPtr;
startPtr = startPtr->ptr;
return p;
}
return NULL;
}
// sort by age in ascending order
void sortAge()
{
Node* startPtr2 = NULL;
while (startPtr)
{
Node* prev = NULL;
Node* curr = startPtr;
Node* prevMax = NULL;
int max = startPtr->age;
while (curr)
{
if (curr->age > max)
{
max = curr->age;
prevMax = prev;
}
prev = curr;
curr = curr->ptr;
}
// Node with the highest age found pass throug the list.
Node* xferNode = removeptr(prevMax);
if (xferNode)
{
xferNode->ptr = startPtr2;
startPtr2 = xferNode;
}
}
startPtr = startPtr2;
}
int main()
{
Node *p;
p = startPtr;
char selection;
do
{
cout << " Patient Menu\n";
cout << " =============================================\n";
cout << " 1. Insert a new record\n";
cout << " 2. List smoker patients\n"; // smoker patient
cout << " 3. List HBP patients\n"; // high blood pressure patient
cout << " 4. List HFD patients\n"; // high fat diet patient
cout << " 5. Delete a patient record by given name\n";
cout << " 6. Exit the program\n";
cout << " =============================================\n";
cout << " Enter your selection: ";
cin >> selection;
cout << endl;
switch (selection)
{
case '1':
getInfo();
break;
case '2':
disp();
break;
case '3':
break;
case '4':
break;
case '5':
break;
case '6':
cout << " Goodbye!\n";
return 0;
break;
default:
break;
}
}while (selection != 6);
/*
disp();
cout << "________________________________________________\n";
sortAge();
disp();*/
system("pause");
return 0;
}

Answer 1

Node *smokers, *hbp, *hfd = NULL;
You could keep a separate linked list for each type - smoker, hbp, hfd and change
void disp()
// to
void disp(Node* linkedList)
and print list given to it
case '2':
disp(smokers);
break;
case '3':
disp(hbp);
break;
case '4':
disp(hfd);
break;
btw, smells like a homework :)