Segmentation fault - creating binary tree

[san12345]

i want to make binary tree program in c, but i am getting segmentation fault error.. my code is this...

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


typedef struct node {
    int data;
    struct  node* left;
    struct node* right;
}node;


int n;


int main()
{
    node *root, *first, *current, *temp; int num,i;
    printf("How many no.\n");
    scanf("%d", &n);
    first = root;
    printf("Enter no.");
    scanf("%d", &root->data);
    for(i=1;i<n;i++) {
        current=first;
        temp = (node*)malloc(sizeof(node));


        printf("Enter no.");
        scanf("%d", &num);
        temp->data=num;
        if(num<current->data) {
            current->left=temp;
        }
        else current->right=temp;
    first=current;


    }
    return 0;
}

i am getting error at this line

        temp = (node*)malloc(sizeof(node));

can anyone tell me what is wrong. and how can i write crud operation on binary tree

[laserlight]

You forgot to allocate space for the root node before you used scanf to read into root->data.

[san12345]

You forgot to allocate space for the root node before you used scanf to read into root->data.

Thank you very much..now its working