C / C++ / MFC

void SinKey(WORD keyCode)
{
	INPUT key;

	key.type = INPUT_KEYBOARD;
	key.ki.wVk = keyCode;
	key.ki.dwFlags = 0;
	key.ki.time = 0;
	key.ki.wScan = 0;
	key.ki.dwExtraInfo = 0;

	SendInput(1,&key,sizeof(INPUT));
	key.ki.dwExtraInfo = KEYEVENTF_KEYUP;
	SendInput(1,&key,sizeof(INPUT));
}

void keyPress(unsigned char keyCode)
{
	keybd_event( keyCode, 0x45, KEYEVENTF_EXTENDEDKEY, 0 );
	keybd_event( keyCode, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0 );
}

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

#define PRODUCT_NAME_LEN 128

typedef struct product_data 
{
    int product_code;
    char product_name[PRODUCT_NAME_LEN];
    int product_cost;
    struct product_data_t *next;
}product_data_t;

typedef struct list 
{
    product_data_t *head;
    product_data_t *tail;
}list_t;

void add(list_t *list, int code, char name[], int cost); 
void initialize(list_t *list);
void clean_up(list_t *list);

int main(void)
{
    list_t *list = NULL;

    initialize(list);
    add(list, 10, "Dell Inspiron", 1500);
    clean_up(list);

    getchar();

    return 0;
}

void add(list_t *list, int code, char name[], int cost)
{
    // Allocate memory for the new product
    list = calloc(1, sizeof(list_t));
    if(!list)
    {
        fprintf(stderr, "Cannot allocated memory");
        exit(1);
    }

    if(list)
    {
        // First item to add to the list
        list->head->product_code = code;
        list->head->product_cost = cost;
        strncpy(list->head->product_name, name, sizeof(list->head->product_name));
        // Terminate the string
        list->head->product_name[127] = '/0';
    } 
}

// Initialize linked list
void initialize(list_t *list)
{
    // Set list node to null
    list = NULL;
    list = NULL;
}

// Release all resources
void clean_up(list_t *list)
{    
    list_t *temp = NULL;

    while(list)
    {
        temp = list->head;
        list->head = list->head->next;
        free(temp);    
    }
    list = NULL;
    list = NULL;
    temp = NULL;
}