002_sll_create_display.cpp

#include <stdio.h>
#include <stdlib.h>

struct node {
    int num;               
    struct node *nextptr;  
} *stnode;            

void createNodeList(int n); 
void displayList();         

int main() {
    int n;

    printf("\n\n Linked List : To create and display Singly Linked List :\n");
    printf("-------------------------------------------------------------\n");

    printf(" Input the number of nodes : ");
    scanf("%d", &n);

    createNodeList(n);

    printf("\n Data entered in the list : \n");
    displayList();

    return 0;
}

void createNodeList(int n) {
    struct node *fnNode, *tmp;
    int num, i;

    stnode = (struct node *)malloc(sizeof(struct node));

    if(stnode == NULL) {
        printf(" Memory can not be allocated.");
    } else {
        printf(" Input data for node 1 : ");
        scanf("%d", &num);
        stnode->num = num;      
        stnode->nextptr = NULL; 
        tmp = stnode;

        for(i = 2; i <= n; i++) {
            fnNode = (struct node *)malloc(sizeof(struct node));

            if(fnNode == NULL) {
                printf(" Memory can not be allocated.");
                break;
            } else {
                printf(" Input data for node %d : ", i);
                scanf(" %d", &num);

                fnNode->num = num;      
                fnNode->nextptr = NULL; 
                tmp->nextptr = fnNode;  
                tmp = tmp->nextptr;    
            }
        }
    }
}

void displayList() {
    struct node *tmp;

    if(stnode == NULL) {
        printf(" List is empty.");
    } else {
        tmp = stnode;

        while(tmp != NULL) {
            printf(" Data = %d\n", tmp->num); 
            tmp = tmp->nextptr;             
        }
    }
}