Program to find all vowels in a string C++

FindVowels.cpp

#include <iostream>

#include <string>

using namespace std;

bool isVowel(char range);

int main() {
  string usrInpt;
  int vwlCnt = 0;
  bool x;

  getline(cin, usrInpt);

  //iterate over all the elements in range
  //for (delcaration : range){statement};
  for (char range: usrInpt) {
    x = isVowel(range);
    if (x == true) {
      vwlCnt++;
    }
  }

  cout << vwlCnt << " vowels in this sentence." << endl;

  return 0;
}

bool isVowel(char range) {
  if (range == 'a' || range == 'A' ||
      range == 'e' || range == 'E' ||
      range == 'i' || range == 'I' ||
      range == 'o' || range == 'O' ||
      range == 'u' || range == 'U') {
    return true;
  } else {
    return false;
  };
}