Language: C++

#include <bits/stdc++.h>
using namespace std;
struct Fast {
    Fast() {
        cin.tie(0);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(20);
    }
} fast;

long long mod = 1000000007;

long long div(long long a, long long b, long long c) { return b / c - (a - 1) / c; }

void print_binary(long long a) {
    for (int i = 31; i >= 0; i--) {
        cout << (a >> i & 1);
    }
    cout << endl;
}
long long modpow(long long m, long long n) {
    if (n == 0) return 1;
    if (n % 2 == 0) {
        long long t = modpow(m, n / 2);
        return t * t;
    } else {
        return modpow(m, n - 1) * m;
    }
}
void yes() {
    cout << "Yes" << endl;
    exit(0);
}
void no() {
    cout << "No" << endl;
    exit(0);
}

int main() {
    long long x, m, ans;
    cin >> x;
    cout << "Christmas" << " " << endl;
    for (int i = 0; i < 25 - x; i++){
        cout << "Eve" << " " << endl;
    }#include <bits/stdc++.h>
using namespace std;
struct Fast {
    Fast() {
        cin.tie(0);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(20);
    }
} fast;

long long mod = 1000000007;

long long div(long long a, long long b, long long c) { return b / c - (a - 1) / c; }

void print_binary(long long a) {
    for (int i = 31; i >= 0; i--) {
        cout << (a >> i & 1);
    }
    cout << endl;
}
long long modpow(long long m, long long n) {
    if (n == 0) return 1;
    if (n % 2 == 0) {
        long long t = modpow(m, n / 2);
        return t * t;
    } else {
        return modpow(m, n - 1) * m;
    }
}
void yes() {
    cout << "Yes" << endl;
    exit(0);
}
void no() {
    cout << "No" << endl;
    exit(0);
}

int main() {
    long long x, m, ans;
    cin >> x;
    cout << "Christmas"
         << " ";
    for (int i = 0; i < 25 - x; i++) {
        cout << "Eve"<< " ";
    }
}
}

Compiler output:
a.cc:45:6: error: stray '#' in program
   45 |     }#include <bits/stdc++.h>
      |      ^
a.cc: In function 'int main()':
a.cc:45:7: error: 'include' was not declared in this scope
   45 |     }#include <bits/stdc++.h>
      |       ^~~~~~~
a.cc:45:16: error: 'bits' was not declared in this scope
   45 |     }#include <bits/stdc++.h>
      |                ^~~~
a.cc:45:21: error: 'stdc' was not declared in this scope; did you mean 'std'?
   45 |     }#include <bits/stdc++.h>
      |                     ^~~~
      |                     std
a.cc:46:1: error: expected primary-expression before 'using'
   46 | using namespace std;
      | ^~~~~
a.cc:57:54: error: a function-definition is not allowed here before '{' token
   57 | long long div(long long a, long long b, long long c) { return b / c - (a - 1) / c; }
      |                                                      ^
a.cc:59:32: error: a function-definition is not allowed here before '{' token
   59 | void print_binary(long long a) {
      |                                ^
a.cc:65:44: error: a function-definition is not allowed here before '{' token
   65 | long long modpow(long long m, long long n) {
      |                                            ^
a.cc:74:12: error: a function-definition is not allowed here before '{' token
   74 | void yes() {
      |            ^
a.cc:78:11: error: a function-definition is not allowed here before '{' token
   78 | void no() {
      |           ^
a.cc:83:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   83 | int main() {
      |         ^~
a.cc:83:9: note: remove parentheses to default-initialize a variable
   83 | int main() {
      |         ^~
      |         --
a.cc:83:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:83:12: error: a function-definition is not allowed here before '{' token
   83 | int main() {
      |            ^