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#include <iostream>using namespace std;//Declaring function isVowel so that main can call itbool isVowel(char x);int main() {    //input character    char c;        //get user input    cout << "Input a letter: ";    cin >> c;        //if isVowel (the function) returns true its a vowel so print that it is a vowel    if (isVowel(c)) cout << endl << c << " is a vowel.";        //if isVowel did not return true it returned false... could have use an else if here, but just else is sufficient    else cout << endl << c << " is a consonant.";        //keep program open    cin >> c;    return 0;}//isVowel definition... returns type bool, takes char type as an inputbool isVowel(char ch) {     //if test on inputted ch char... uses | for or     if ((ch == 'a') || (ch == 'e') || (ch == 'i') || (ch == 'o') || (ch == 'u') ||(ch == 'A') || (ch == 'E') || (ch == 'I') || (ch == 'O') || (ch == 'U')) return true;     //if not true then return false     else     return false;}