C Program of singly Linked List.

This is a simple program to create singly linked list of adding, deleting, and displaying the nodes from front.

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//Header files #include <stdio.h> #include <conio.h> #include <math.h> //structure for a node struct node { int data; struct node *next; }*first,*temp,*dis; /*first is the first node,temp is the temporary new node and display is a temporary node for displaying linked list*/ //this function creates OR adds a new node to the linked list void create() { int d; //Variable for storing the data in the node temp=(struct node*)malloc(sizeof(struct node)); /*using memory allocation function to allocate memory for that node from availiblity stack(memory)*/ printf("\nInsert the data:"); scanf("%d",&d); temp->data=d; //Storing data into the node if (first==NULL) //if the list does not exist i.e 'First=NULL' than create first node { first=temp; first->next=NULL; } else //else add that node to the front { temp->link=first; first=temp; } } //Funciton to delete the first node void listdel() { struct node *tem; //temporary node int t; if(first==NULL) //check for empty list { printf("\n\t\tLinked list empty"); } else { tem=first; //allocating first node as tem node first=tem->next;//deleting the first node t=tem->data; free(tem); //freeing the memory allocated to that node printf("\ndata deleted is %d\n",t); } } //Function to display link list void display() { struct node *tem; tem=first; printf("\n\nThe LINKED LIST IS AS BELOW:\n"); while(tem!=NULL) { printf("%d-->",tem->data); tem=tem->next; } printf("NULL\n"); } //MAIN PROGRAM void main() { int p; char c; clrscr(); do { printf("\nWhat do u want to do:\n" ); printf("\n1)create a node\n2)displaylinked list\n3)delete a node\n"); scanf("%d",&p); switch(p) { case 1:create(); break; case 2:display(); break; case 3: listdel(); break; default: printf("\n\t\tWrong choice\n"); } printf("\nDo u wanty to continue?(y/n)\n"); c=getch(); } while(c=='y'||c=='Y'); }