Compilation errors on Codeforces, using MS visual studio 2019 C++

Question

#include <iostream>

using namespace std;

int main() { //Main Function

int w;
cout << "enter the weight of the watermelon: ";
cin >> w;

if (w <= 1 or w >= 100) {
cout << "error";
}

else {
if (w % 2 == 0) {
cout << "YES";
}
else {
cout << "NO";
}
}
return 0;

Compilation Errors:

 syntax error: missing ')' before identifier 'or'
 error C2065: 'or': undeclared identifier
 error C2146: syntax error: missing ';' before identifier 'w'
 error C2059: syntax error: ')'
 error C2059: syntax error: ';'
 error C2059: syntax error: 'else'
 error C2143: syntax error: missing ';' before '{'
 error C2447: '{': missing function header (old-style formal list?)
 error C2059: syntax error: 'return'
 error C2059: syntax error: '}'
 error C2143: syntax error: missing ';' before '}'

Answer 1

or in C++ is an "alternative token".

Your version of Visual Studio doesn't support these alternative tokens in your compilation mode.

Technically, that is in violation of the C++ standard.

However, it would anyway be more conventional to write ||, so just do that.