Some constants define in headers of C++ (Part-I)

1._ALLOCA_S_THRESHOLD: It expands to 1024.

#define _ALLOCA_S_THRESHOLD 1024

This is available in the file malloc.h

2.__ATOMIC_RELEASE: It expands to 3.

#define __ATOMIC_RELEASE 3

3. LC_ALL: It expands to 0.

#define LC_ALL 0

4.__GCC_ATOMIC_CHAR16_T_LOCK_FREE: It expands to 2.

#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2

5. __GCC_ATOMIC_INT_LOCK_FREE: It expands to 2.

#define __GCC_ATOMIC_INT_LOCK_FREE 2

Output:

1024
3
0
2
2

Approach:

C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    cout << _ALLOCA_S_THRESHOLD << "\n";

    cout << __ATOMIC_RELEASE << "\n";

    cout << LC_ALL << "\n";

    cout << __GCC_ATOMIC_CHAR16_T_LOCK_FREE << "\n";

    cout << __GCC_ATOMIC_INT_LOCK_FREE << "\n";

    return 0;
}