Need help with a C++ program please?

Question

ok I wrote something not sure how right it is but i do need some help on it
here is what i have:
int menu(int x){
cout<<"Press 1 to encrypt, 2 to decrypt, 3 to quit)"< cin>>x;
return x;
}
void encrypt(char letter){
cout<<"Enter a message to encrypt"< cin>>letter;
while (letter!='!'){
if (letter=='k') cout<<"1 ";
then 26 more if statements for letters
cin>>letter;
}
return;
}



void decrypt(int code){
cin>>code;
while (code!=0){
if (code==1) cout<<"k";
26 more if statements
cin>>code;
}
return;
}




int main(){

int choice;
int shift = 7; // default shift
choice = menu();************
while (choice != 3){
if (choice == 1){
cout << "Enter the 'shift' value: ";
cin >> shift;
encrypt(shift); }
else
decrypt();************

cout< choice = menu(); **********
}
return 0

when I try to run this it gives me errors where i put down starts (3 of them)
the error says function does not take 0 arguments
I'm not sure what I'm supposed to put inside the parentheses to make this right
and also, somehow I need to change the function encrypt from encrypt(char) to encrypt(int) I dont know how to do that either

Answer 1

Your function menu() does not take zero arguments. It need one argument, as per the function definition. What you want is
int menu(),

and what you have done is

int menu(int x)

And you are not using this parameter x at all.

Answer 2

Surely: your menu() function requires int as an argument.
Check you code thoroughly :-)