c - uninitialized local variable 'num' used? -

#include<stdio.h> #include<conio.h>  int main() {     int num;     printf("enter number \n");     scanf_s("%d", num);     printf("your number %d", num);     _getch();     return 0; } 

when build above code in vs2013 gives me following error :

error c4700: uninitialized local variable 'num' used ?? whhat reason ??

you forgot &:

scanf_s("%d", &num); 

scanf expect pointer, reading value of num find address write user input (and num not initialized, that's why compiler raise warning). meant address of num itself.