Shouldn't there be an error in the following code? [duplicate]

This question already has an answer here:

• Accessing an array out of bounds gives no error, why? 17 answers

#include<bits/stdc++.h>

using namespace std;

int main() {
    int a[5];
    for(int i=0;i<=5;i++) {
        cin >> a[i];
    }       
    for(int i=0;i<=5;i++) {
        cout << a[i];
    }
}

The array size is 5 and it is able to scan 6 elements in it. Stack smashing error or segmentation fault should come, but the compiler simply accepts the 6 elements and displays them properly too. What is it that I'm missing?