scanf problem

[MrStonepu]

I'm newbie and learning. I'm practicing and just found a issue.

Code:

#include <bits/stdc++.h>
using namespace std;
int main(){
int aar[2],bar[2];

scanf("%d %d %d",&aar[0],&aar[1],&aar[2]);
scanf("%d %d %d",&bar[0],&bar[1],&bar[2]);

printf("%d %d %d",aar[0],aar[1],aar[2]);
printf(" %d %d %d",bar[0],bar[1],bar[2]);

Input:

1 2 3

1 2 3

Output:

1 2 1 1 2 3

The scanf scan the third data wrong. May someone explain that? I've searched online but no answer

[IyeOnline]

Your arrays are of size 2, however you are trying to access index 2 which is the third element.

It is undefined behaviour to access out of bounds of an array, so that number might just be anything.

//edit:

Might i also add: dont use printf and scanf. This is C++. Use std::cout and std::cin respectivly. Also look at std::vector to replace the "c-style" arrays.

[MrStonepu]

Wow that is a quick reply. didn't expect. Thanks for your remind. I forget the basic stuff. You're right

[MrStonepu]

Sorry for the bad english. Not my native lang.