Why is the code is not removing “u” from the input string?

Question

I am learning C++. Today I have written a code to remove vowels form a string. It works fine in some tests. But this test is failing to remove "u" from a string. M

Answer 1

Here's how you can do it more easily:

#include 
#include 
#include 
#include 
#include 

constexpr auto isVowel(unsigned char const ch) noexcept {
  constexpr std::array vowels{
      'a', 'e', 'i', 'o', 'u',
  };
  return std::find(vowels.begin(), vowels.end(), std::tolower(ch)) !=
         vowels.end();
}

int main() {
  std::string str = "Tour";
  str.erase(std::remove_if(str.begin(), str.end(), isVowel), str.end());
  std::cout << str << '\n';
}

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