Header.cpp

#include<iostream>
#include<string>
#include<stdlib.h>
using namespace std;

struct Header{
    string attribute_name;
    struct Header* link;
};

// memory leak occurs

struct Header* getNode(){
    struct Header *temp;
    temp = (struct Header*) malloc(sizeof(struct Header));
    return temp;
}

void createHeader(struct Header *head, string str){
    struct Header *temp, *ptr;
    temp = getNode();
    temp->attribute_name = str;
    ptr = head;
    if(head == NULL){
        head = temp;
        ptr = temp;
    }
    else{
        while(ptr->link!=NULL)
            ptr = ptr->link;
        ptr->link = temp;
    }
}

void showHeader(struct Header *head){
    struct Header *ptr;
    ptr=head;
    while(ptr!=NULL){
        cout<<ptr->attribute_name<<"\t";
        ptr=ptr->link;
    }
}

// void setPrimaryKey(struct Header *head, string at_name){
//     struct Header *ptr;
//     ptr=head;
//     while(ptr!=NULL){
//         if(ptr->attribute_name==at_name){
//             ptr->attribute_name=at_name+"key";
//             break;
//         }
//         ptr = ptr->link;
//     }

//     cout<<at_name<<" is set as the primary key";
// }

int main(){
    struct Header *myheader;
    createHeader(myheader, "NAME");
    createHeader(myheader, "ROLL");
    createHeader(myheader, "MARKS");
    showHeader(myheader);
    return 0;
}