#include <iostream>
#include <cctype>
 
//Forward Declarations
void menu();
void select_M();
void select_A();
void select_C();
void select_N();
void select_E();
char isValid(char &);
void selection_error();
 
//MAIN
int main(){ 
 
    menu();
 
    return 0;
}
 
//MAIN MENU
void menu(){
    char selection{}; //declares and initiallizes selection to null
 
    std::cout << "(M) Selection 1" << std::endl;
    std::cout << "(A) Selection 2" << std::endl;
    std::cout << "(C) Selection 3" << std::endl;
    std::cout << "(N) Selection 4" << std::endl;
    std::cout << "(E) Selection 5" << std::endl;
    std::cout << "(Q) Quit" << std::endl;
    std::cout << std::endl;
    std::cout << "Enter your selection: ";
    isValid(selection);
 
    switch(selection){
        case 'M':  select_M(); break;
        case 'A': select_A(); break;
        case 'C': select_C(); break;
        case 'N': select_N(); break;
        case 'E': select_E(); break;
        case 'Q': return; //break;
        default: selection_error(); break;
 
    }//switch
    system("cls"); //used for testing - not recommended for use in actual program
    menu();
}//menu
 
//INPUT VALIDATION
char isValid(char &selection){
 
    std::cin >> selection;
    selection = toupper(selection); // ctype.h for toupper changes all to uppercase characters
 
    //checks to see if more than 1 character is inputed
    if (std::cin.get() != '\n'){
            std::cin.ignore(256, '\n'); //ignores 256 chars until newline('\n')
            std::cin.clear(); // clears the input
            selection = '\0'; // sets selection to null
            system("cls");//used for testing - not recommended for use in actual program
    }
    return selection;
}
 
 
void selection_error(){
    std::cout << "Invaild Selection"<< std::endl;
    system("pause"); //used for testing - not recommended for use in actual program
}
 
void select_M(){
    std::cout << "M was Selected"<< std::endl;
    system("pause"); //used for testing - not recommended for use in actual program
}
 
void select_A(){
    std::cout << "A was Selected"<< std::endl;
    system("pause"); //used for testing - not recommended for use in actual program
}
 
void select_C(){
    std::cout << "C was Selected"<< std::endl;
    system("pause"); //used for testing - not recommended for use in actual program
}
 
void select_N(){
    std::cout << "N was Selected"<< std::endl;
    system("pause"); //used for testing - not recommended for use in actual program
}
 
void select_E(){
    std::cout << "E was Selected"<< std::endl;
    system("pause"); //used for testing - not recommended for use in actual program
}

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