Homework help (ROT13)

[paper hearth]

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[limber axle]

#include <iostream>
using namespace std;
int main()

{
string input;
cout << "Enter a letter (A - Z): " ; getline(cin, input);
string output = "";
for (int i = 0; i < input.length(); i++) { char c = input[i];
if (isalpha(c)) { if (isupper(c)) { c = 'A' + (c - 'A' + 13) % 26; }
else { c = 'a' + (c - 'a' + 13) % 26; } } output += c; }
cout <<"ROT13 Caesar Cipher for " <<input; cout <<" - > " << output; return 0;

}

That's my code for the Rot13 translation but I don't know how to display an Error

Homework help (ROT13)