#include <stdio.h>
typedef struct NodeTag{
	//layout: horizontal
	int val;
	struct NodeTag *next;
} Node;
	
typedef Node *Position;
typedef Position List;

void insert(int x, Position p) {
	Position temp = malloc(sizeof(Node));
	temp->val = x;
	temp->next = p->next;
	p->next = temp;
}

int main() {
	Position header = malloc(sizeof(Node))
			/*background-color:gray*/; 
	header->next = 0;
	List L = header;
		
	//Insert 6 at begin of L
	insert(6, L);		
	
	//Insert 7 at begin of L
	insert(7, L);
	return 0;
}

Input

Output

Debug

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Status

C Playground for (small) C language