Mine

#include <iostream>
using namespace std;
void display_menue();
int grab_data();

int main(){
cout << grab_data();



}


void display_menue(){
cout << "1. (M)ultiply" << endl;
cout << "2. (D)ivide" << endl;
cout << "3. (A)dd" << endl;
cout << "4. (S)ubtraction" << endl;
cout << "5. sq(U)are" << endl;
cout << "6. (Q)uit" << endl;
cout << "Please make a selection:  " << endl;
}

int grab_data(){
char user_data;
display_menue();
cin.get(user_data);
while(user_data != '1' && user_data != 'M' && user_data != 'm' && user_data != '2' && user_data != 'D' && user_data != 'd' && user_data != '3' && user_data != 'a' && user_data != 'A' && user_data != '4' && user_data != 's' && user_data != 'S' && user_data != '5' && user_data != 'U' && user_data != 'u' && user_data != '6' && user_data != 'q' && user_data != 'Q'){
display_menue();
cout << "ERROR!: Your choice you've selected is Invalid, please select a valid choice." << endl;
cin.get(user_data);
}
return user_data;
}

outputs::


1. (M)ultiply
2. (D)ivide
3. (A)dd
4. (S)ubtraction
5. sq(U)are
6. (Q)uit
Please make a selection:
--
1. (M)ultiply
2. (D)ivide
3. (A)dd
4. (S)ubtraction
5. sq(U)are
6. (Q)uit
Please make a selection:
ERROR!: Your choice you've selected is Invalid, please select a valid choice.
1. (M)ultiply
2. (D)ivide
3. (A)dd
4. (S)ubtraction
5. sq(U)are
6. (Q)uit
Please make a selection:
ERROR!: Your choice you've selected is Invalid, please select a valid choice.
1. (M)ultiply
2. (D)ivide
3. (A)dd
4. (S)ubtraction
5. sq(U)are
6. (Q)uit
Please make a selection:
ERROR!: Your choice you've selected is Invalid, please select a valid choice.