Create Check Vowel or a Consonant Manually

Check Vowel or a Consonant Manually

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+#include <iostream>
+using namespace std;
+
+int main() {
+    char c;
+    bool isLowercaseVowel, isUppercaseVowel;
+
+    cout << "Enter an alphabet: ";
+    cin >> c;
+
+    // evaluates to 1 (true) if c is a lowercase vowel
+    isLowercaseVowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
+
+    // evaluates to 1 (true) if c is an uppercase vowel
+    isUppercaseVowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');
+
+    // show error message if c is not an alphabet
+    if (!isalpha(c))
+      printf("Error! Non-alphabetic character.");
+    else if (isLowercaseVowel || isUppercaseVowel)
+        cout << c << " is a vowel.";
+    else
+        cout << c << " is a consonant.";
+
+    return 0;
+}