// the code is not deleting the patients when we input the name of the patient #

Question

// the code is not deleting the patients when we input the name of the patient
#include <iostream>
#include <string>
using namespace std;
struct Node
{
   string Name;
   int id;
   int age;
   char smoker;
   char HBP;
   char HFD;
   int Points;
   Node *ptr;
};

Node *startPtr = NULL;
int count;

void add(Node **root)
{
   Node *p = new Node;
   int agePoints,smkPoints,hbpPoints,hfdPoints;
   int count=0;
   cout << "   Please enter the name of the patient : ";
   cin >> p->Name;
   cout << "   Please enter the ID : ";
   cin >> p->id;
   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;
   if (p-> smoker =='Y'||p->smoker == 'y')
       count++;

   if (p-> age < 18)
   {
       agePoints = 2;
   }
   else if (p->age > 18 && p->age <30)
   {
       agePoints = 3;
   }
   else
   {
       agePoints = 4;
   }

   if (p-> smoker =='Y'||p->smoker == 'y')
   {
       p->smoker = 'Y';
       smkPoints = 4;
   }
   else
   {
       p->smoker = 'N';
       smkPoints = 0;
   }

   if (p->HBP == 'Y' || p->HBP == 'y')
   {
       p->HBP = 'Y';
       hbpPoints = 4;
   }
   else
   {
       p->HBP = 'N';
       hbpPoints = 0;
   }

   if (p->HFD == 'Y' || p->HFD == 'y')
   {
       p->HFD = 'Y';
       hfdPoints = 1;
   }
   else
   {
       p->HFD = 'N';
       hfdPoints = 0;
   }

   p->Points = agePoints + smkPoints + hbpPoints + hfdPoints;

   if(*root == NULL)
       *root = p;
   else
   {
       Node *temp = *root;
       while(temp->ptr != NULL)
       {
           temp =temp->ptr;
       }
       temp->ptr = p;
   }
}

void displayPatient(Node *p)
{
   cout<<"Patient id: "<<p->id<<endl;
   cout<<"Patient Name: "<<p->Name<<endl;
   cout<<"Age: "<<p->age<<endl;
   cout<<"Smoker: "<<p->smoker<<endl;
   cout<<"Suffers from High Blood Pressure: "<<p->HBP<<endl;
   cout<<"Takes High Fat Diet: "<<p->HFD<<endl;
   cout<<"Total points of the patient: "<<p->Points<<endl<<endl;
}

void displayAllPatients(Node *root)
{
   Node *temp = root;
   while(temp != NULL)
   {
       displayPatient(temp);
       temp = temp->ptr;
   }
}

void dispsmoker(Node *root)
{
   Node *temp = root;
   while(temp != NULL)
   {
       if(temp->smoker=='Y')
       {
           displayPatient(temp);
       }
       temp = temp->ptr;
   }
}

void dispHBP(Node *root)
{
   Node *temp = root;
   while(temp != NULL)
   {
       if(temp->HBP=='Y')
       {
           displayPatient(temp);
       }
       temp = temp->ptr;
   }
}

void dispHFD(Node *root)
{
   Node *temp = root;
   while(temp != NULL)
   {
       if(temp->HFD=='Y')
       {
           displayPatient(temp);
       }
       temp = temp->ptr;
   }
}

void deleteNode(Node *root)
{
   Node *p;
   Node *temp;
   string name;

   cout<<"Enter the name of the patient to be deleted: ";
   cin>>name;

   Node *current = startPtr;
   Node *prev = NULL;

   while(current != NULL && current->Name != name)
   {
       prev = current;
       current = current->ptr;
   }

   if(current != NULL && current->Name == name)
   {
       if(prev == NULL)
           startPtr = startPtr->ptr;
       else
           prev->ptr = current->ptr;
   }
   else
       cout << "The patient is not available"<< endl <<endl;
}

void smokers(Node *root)
{
   Node *temp = root;
   int count = 0;
   while(temp != NULL)
   {
       if(temp->smoker == 'Y')
           count++;
       temp = temp->ptr;
   }
   cout<<"Total number of smokers"<<count<<endl;
}

int main()
{
   int choice,id;
   Node *root = NULL;
   while(1)
   {
       cout<<"Patient Menu ";
       cout<<"============================================= ";
       cout<<"1. Insert a new record ";
       cout<<"2. List of all patients ";
       cout<<"3. List smoker patients ";
       cout<<"4. List HBP patients ";
       cout<<"5. List HFD patients ";
       cout<<"6. Delete a patient record by given name ";
       cout<<"7. Display total number of smokers ";
       cout<<"8. Exit the program ";
       cout<<"============================================= ";
       cout<<"Enter your selection: ";
       cin>>choice;
       switch(choice)
       {
       case 1:
           add(&root);
           break;
       case 2:
           cout<<"List of patients: ";
           cout<<"Listers"<<endl;
           displayAllPatients(root);
           break;
       case 3:
           cout<<"List of smoker patients: ";
           cout<<"Listers"<<endl;
           dispsmoker(root);
           break;
       case 4:
           cout<<"List of HBP patients: ";
           dispHBP(root);
           break;
       case 5:
           cout<<"List of HFD patients: ";
           dispHFD(root);
           break;
       case 6:
           deleteNode(root);
           break;
       case 7:
           cout<<"Total number of smokers ";
           smokers(root);
           break;
       case 8:
           exit(1);
       default: cout<<"Invalid choice.";
       }
   }

   system("pause");
   return 0;
}

Explanation / Answer

#include <iostream>

#include <string>

using namespace std;

struct Node

{

string Name;

int id;

int age;

char smoker;

char HBP;

char HFD;

int Points;

Node *ptr;

};

Node *startPtr = NULL;

int count;

void add(Node **root)

{

Node *p = new Node;

int agePoints,smkPoints,hbpPoints,hfdPoints;

int count=0;

cout << " Please enter the name of the patient : ";

cin >> p->Name;

cout << " Please enter the ID : ";

cin >> p->id;

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;

if (p-> smoker =='Y'||p->smoker == 'y')

count++;

if (p-> age < 18)

{

agePoints = 2;

}

else if (p->age > 18 && p->age <30)

{

agePoints = 3;

}

else

{

agePoints = 4;

}

if (p-> smoker =='Y'||p->smoker == 'y')

{

p->smoker = 'Y';

smkPoints = 4;

}

else

{

p->smoker = 'N';

smkPoints = 0;

}

if (p->HBP == 'Y' || p->HBP == 'y')

{

p->HBP = 'Y';

hbpPoints = 4;

}

else

{

p->HBP = 'N';

hbpPoints = 0;

}

if (p->HFD == 'Y' || p->HFD == 'y')

{

p->HFD = 'Y';

hfdPoints = 1;

}

else

{

p->HFD = 'N';

hfdPoints = 0;

}

p->Points = agePoints + smkPoints + hbpPoints + hfdPoints;

if(*root == NULL)

*root = p;

else

{

Node *temp = *root;

while(temp->ptr != NULL)

{

temp =temp->ptr;

}

temp->ptr = p;

}

}

void displayPatient(Node *p)

{

cout<<"Patient id: "<<p->id<<endl;

cout<<"Patient Name: "<<p->Name<<endl;

cout<<"Age: "<<p->age<<endl;

cout<<"Smoker: "<<p->smoker<<endl;

cout<<"Suffers from High Blood Pressure: "<<p->HBP<<endl;

cout<<"Takes High Fat Diet: "<<p->HFD<<endl;

cout<<"Total points of the patient: "<<p->Points<<endl<<endl;

}

void displayAllPatients(Node *root)

{

Node *temp = root;

while(temp != NULL)

{

displayPatient(temp);

temp = temp->ptr;

}

}

void dispsmoker(Node *root)

{

Node *temp = root;

while(temp != NULL)

{

if(temp->smoker=='Y')

{

displayPatient(temp);

}

temp = temp->ptr;

}

}

void dispHBP(Node *root)

{

Node *temp = root;

while(temp != NULL)

{

if(temp->HBP=='Y')

{

displayPatient(temp);

}

temp = temp->ptr;

}

}

void dispHFD(Node *root)

{

Node *temp = root;

while(temp != NULL)

{

if(temp->HFD=='Y')

{

displayPatient(temp);

}

temp = temp->ptr;

}

}

void deleteNode(Node **root)

{

Node *p;

Node *temp;

string name;

  

cout<<"Enter the name of the patient to be deleted: ";

cin>>name;

Node *current = *root;

Node *prev = NULL;

while(current != NULL && current->Name != name)

{

prev = current;

current = current->ptr;

}

  

if(current != NULL && current->Name == name)

{

if(prev == NULL)

{

*root = current->ptr;

}

else

prev->ptr = current->ptr;

  

delete current;

cout << "Patient deleted" << endl << endl;

}

else

cout << "The patient is not available"<< endl <<endl;

}

void smokers(Node *root)

{

Node *temp = root;

int count = 0;

while(temp != NULL)

{

if(temp->smoker == 'Y')

count++;

temp = temp->ptr;

}

cout<<"Total number of smokers"<<count<<endl;

}

int main()

{

int choice,id;

Node *root = NULL;

while(1)

{

cout<<"Patient Menu ";

cout<<"============================================= ";

cout<<"1. Insert a new record ";

cout<<"2. List of all patients ";

cout<<"3. List smoker patients ";

cout<<"4. List HBP patients ";

cout<<"5. List HFD patients ";

cout<<"6. Delete a patient record by given name ";

cout<<"7. Display total number of smokers ";

cout<<"8. Exit the program ";

cout<<"============================================= ";

cout<<"Enter your selection: ";

cin>>choice;

switch(choice)

{

case 1:

add(&root);

break;

case 2:

cout<<"List of patients: ";

cout<<"Listers"<<endl;

displayAllPatients(root);

break;

case 3:

cout<<"List of smoker patients: ";

cout<<"Listers"<<endl;

dispsmoker(root);

break;

case 4:

cout<<"List of HBP patients: ";

dispHBP(root);

break;

case 5:

cout<<"List of HFD patients: ";

dispHFD(root);

break;

case 6:

deleteNode(&root);

break;

case 7:

cout<<"Total number of smokers ";

smokers(root);

break;

case 8:

exit(1);

default: cout<<"Invalid choice.";

}

}

system("pause");

return 0;

}

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