Thread: Help on coding, possible memory allocation error.

I'm trying to understand linked list by writing a program but I seem to meet with wierd problems. Can anyone be helpful enough to help?

Code:

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

typedef struct stringnode{
	char *string; //pointer to string
	struct stringnode *next; //points to next node
} node;

void printlist(node *);
void printtable();
void addnode(node **);

void main(){
	int input=1;

	printf("\n\nWelcome to the Linked List Creation Program v1.0!!");
	printf("\nThis program tests out the implementation of one linked list\n");

	node *linklist=NULL; //creates a pointer of type node which points to NULL

	while (input!=0){

		printlist(linklist);
		printtable();
		scanf("%d", &input);

		switch(input){
			case 1:
				addnode(&linklist);
				break;
			case 2:
				break;
			case 0:
				printf("Program Terminating...");
				break;
			default:
				printf("Command not recognized!");
				break;
		} // End of switch function

	} // End of while

	return;
}

....

void addnode(node **list){
	int addPlace, x;
	char word[101];
	node *temp, *temp2;

	temp = (node *)malloc(sizeof(node)); //flag one
	temp = *list;

	printlist(*list);
	printf("\n\nPlease input the word you wish to add (enter any number to exit)");
		//fgets(word, sizeof(word), stdin);
		scanf("%s", &word);
		if (isdigit(word[0])) return; //terminates function if data is numeric

	printf("Where do you wish to add the new node after (0 to add at top)?");
		scanf("%d", &addPlace);

	printf("string:%s", word);
	printf("\nnumber: %d", addPlace);

	if(addPlace > 1 ){
		for(x=1;x<addPlace;x++){
			temp = temp->next;
		}
	} // end of if

	if(*list == NULL){ //for first node only
		temp2 = (node *)malloc(sizeof(node));
		temp2->next = NULL;
		strcpy(temp2->string, word);
		*list = temp2;
	} else {
		temp2 = (node* )malloc(sizeof(node)); //flag two
		temp2->next = temp->next; //flag three
		strcpy(temp2->string, word);
		temp->next = temp2;
	}

	//free(temp2);
	printf("\nWord is added successfully...");

	return;
}

To save space I ... the two functions which I believe have nothing to do with the problem. Within the main there is a loop which accesses the function addnode whenever I choose. My problem now is that when I access addnode for the second time after looping while once, my program terminates prematurely at the temp = (node *)malloc(sizeof(node)) which I commented //flag one on the code. If I comment that line, the program would terminate prematurely at the temp2 = (node*)malloc(sizeof(node)) which I commented //flag two. If I continue to comment that line, my program terminates prematurely at the place which I commented //flag three.

Its really frustruating because I do not get any syntax errors with the compiler and I cannot debug. Can Anyone help me with it?