Write a program using a series of if statements to count the number of vowels in text read from cin

#include <iostream>

int main() {
  unsigned aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0;
  char ch;
  while (std::cin >> ch) {
    if (ch == 'a')
      ++aCnt;
    else if (ch == 'e')
      ++eCnt;
    else if (ch == 'i')
      ++iCnt;
    else if (ch == 'o')
      ++oCnt;
    else if (ch == 'u')
      ++uCnt;
  }
  std::cout << "Number of vowel a: " << aCnt << '\n'
            << "Number of vowel e: " << eCnt << '\n'
            << "Number of vowel i: " << iCnt << '\n'
            << "Number of vowel o: " << oCnt << '\n'
            << "Number of vowel u: " << uCnt << std::endl;

  return 0;
}