Getting LNK2019 error

using namespace std;

void IntroToTheGame()
constexpr int WORD_LENGTH = 5;
cout << “wellcome to Bulls and Cows.\n”;
cout << “can you guess the” << WORD_LENGTH;
cout << " letter isogram i must be thinking of?\n";
cout << endl;

this is the code I wrote, its getting some linker error , the error is as follows :

  1. Error LNK2019 unresolved external symbol _main referenced in function “int __cdecl invoke_main(void)” (?invoke_main@@YAHXZ) BullsAndCowsGame C:\Users\HP\source\repos\section_02\BullsAndCowsGame\MSVCRTD.lib(exe_main.obj) 1
  2. unresolved externals

can I be helped where I am wrong?

You haven’t defined int main() which is required.

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