链表创建-程序在输入后停止工作

Question

In the following linked list creation program, after input, the program stops working. The code after printf("\\n nodes entered are:\\n) is not running.

The if in for loop is used for creation of head or start node.

#include<stdio.h>
#include<conio.h>
#include<malloc.h>
    //creating a linked list
    typedef struct node
    {
    int data;
    struct node *link;
    }node;

int main()
{

    int i,n;
    node* temp;
    node* start=0;

    printf("Enter the no of elements in the linked list\n");
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        if(i==0)                                                                //for first node
        {
        node* start=(node*)malloc(sizeof(node));
        scanf("%d",&(start->data));
        start->link=NULL;
        temp=start;
        }
        else
        {
            node *nextnode=(node *)malloc(sizeof(node));
            scanf("%d",&(nextnode->data));
            temp->link=nextnode;
            nextnode->link=NULL;
            temp=nextnode;                                                      //updating temp for next iteration
        }
    }
    printf("\n nodes entered are:\n");
    temp=start;
    while(temp->link!=NULL)
    {
            printf("%d ",temp->data);
            temp=temp->link;
    }

printf("%d",temp->data);
getch();
return 0;
}

Answer 1

Change this code snippet

    if(i==0)                                                                //for first node
    {
    node* start=(node*)malloc(sizeof(node));

to

    if(i==0)                                                                //for first node
    {
         start=(node*)malloc(sizeof(node));

Otherwise inside the compound statement of the if statement you are declaring local variable start that hides previously declared variable start and that will be deleted after execution of this compound statement.