#include <algorithm>
#include <iostream>

bool ist_vokal(char c)
{
  return c=='a' || c=='e' || c=='i' || c=='o' || c=='u';
}

int main()
{
  const char str[] = "Hallo Welt";

  const char *pos = std::find_if_not(str, str+10, ist_vokal);
    
  if (pos != end(str)) 
  {
    std::cout << pos << '\n';
  }
}