#include <iostream> #include <string> #include <cctype> using namespace std; int main() { string text = "Hello World"; int count = 0; for (char c : text) { c = tolower(c); if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u') { count++; } } cout << "Number of vowels: " << count; return 0; }