Thread: Cant use as function...?

using islower() i get a error

Code:

#include <iostream>
#include <string>
#include <windows.h>
using namespace std;

int main()
{
  string theWord = ""; // do not need an array at all

  cout << "Hello their input some words: ";
  getline (cin,theWord=islower());
  
for ( int i = 0; i < theWord.size(); i++ ) {
        cout << theWord[ i ] << "";
        Sleep(100);
    }
return 0;
}

to few arguments to function


edit: Same with upper same error