c++ - C4473 warning for structure assignment -

i working on assignment , curious warning when compiling , how remedy it. build when debug error screen. below warning comes up.

1>c:\users\cesteves\documents\c programming\inventory\inventory\inventory.cpp(48): warning c4473: 'scanf_s' : not enough arguments passed format string

note: placeholders , parameters expect 2 variadic arguments, 1 provided

note: missing variadic argument 2 required format string '%s' note: argument used buffer size

#include "stdafx.h" #include <stdio.h>  void main() {     struct date {         int day;         int month;         int year;     };      struct details {         char name[20];         int price;         int code;         int qty;         struct date mfg;     };      struct details item[50];     int n, i;      printf("enter number of items:");     scanf_s("%d", &n);      (i = 0; < n; i++) {         printf("item name: \n");         scanf_s("%s", item[i].name);         printf("item code: \n");         scanf_s("%d", &item[i].code);         printf("quantity: \n");         scanf_s("%d", &item[i].qty);         printf("price: \n");         scanf_s("%d", &item[i].price);         printf("manufacturing date(dd-mm-yyyy): \n");         scanf_s("%d-%d-%d", &item[i].mfg.day, &item[i].mfg.month, &item[i].mfg.year);         }      printf("             *****  inventory ***** \n");     printf("----------------------------------------------------------------- - \n");     printf("s.n.|    name           |   code   |  quantity |  price| mfg.date \n");     printf("----------------------------------------------------------------- - \n");      (i = 0; < n; i++)         printf("%d     %-15s        %-d          %-5d     %-5d%d / %d / %d \n", + 1, item[i].name, item[i].code, item[i].qty,item[i].price, item[i].mfg.day, item[i].mfg.month,item[i].mfg.year);     printf("----------------------------------------------------------------- - \n"); } 

you should provide size of buffer. example, if reading 1 char, should this:

char c; scanf_s("%c", &c, 1); 

please read ref!

also, structs nice placed before main(). have example in mind, on basic usage of structs.

the prototype of main should int main(void) in case. check this: int main() vs void main() in c

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in code, change this:

scanf_s("%s", item[i].name); 

to this:

scanf_s("%s", item[i].name, 20); 

because of this:

struct details {   char name[20];   ..   

do same rest..