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Sentinel value question

tirexc (3)
What statement should i provide that would tell the user which is the sentinel value in this code?
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 #include <iostream>

using namespace std;

int main(){

char letter = 'a';

while (letter != 'x')

{cout << "Please enter a letter" << endl;

cin >> letter;

cout << "The letter your entered is " << letter << endl;}

return 0;

}
tirexc (3)
The sentinel statement is missing, i have to provide it...
shadowCODE (680)
that would tell the user

Tell the user by printing info on the screen.
shadowCODE (680)
The sentinel is 'x'
tirexc (3)
ok thanks man
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