#include <stdio.h> #include <string.h> #include <ctype.h> int countVowels(char text[]) { int count = 0; for (int i = 0; i < strlen(text); i++) { char c = tolower(text[i]); if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u') { count++; } } return count; } int main() { printf("%d\n", countVowels("Hello World")); // 3 printf("%d\n", countVowels("bcd")); // 0 printf("%d\n", countVowels("")); // 0 printf("%d\n", countVowels("APPLE")); // 2 return 0; }