Question

12.22 Chapter 4: Encrypt Characters

Simple Caesar Cipher challenge. You'll need to correct code to print ciphertext character correctly.

With offset of 3 the output should be

ORIGINAL CHARACTERS
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 
ENCRYPTED CHARACTERS
D E F G H I J K L M N O P Q R S T U V W X Y Z A B C 

Given:

/*
   Print Ciphertext Characters Correctly
*/

#include <iostream>
using namespace std;

int main(){
int i;
char c;
int offset =0;

cin>>offset;

cout << "ORIGINAL CHARACTERS" << endl;
for (i=65; i<=90; ++i){
    c = i;
    cout << c << ' ';
}
cout << endl;

cout << "ENCRYPTED CHARACTERS" << endl;  
for (i=65; i<=90; ++i){
    c = i + offset;
    cout << c << ' ';
}

return 0;
}

Answer 1

/*
   Print Ciphertext Characters Correctly
*/

#include <iostream>

using namespace std;

int main() {
    int i;
    char c;
    int offset = 0;

    cin >> offset;

    cout << "ORIGINAL CHARACTERS" << endl;
    for (i = 65; i <= 90; ++i) {
        c = (char) i;
        cout << c << ' ';
    }
    cout << endl;

    cout << "ENCRYPTED CHARACTERS" << endl;
    for (i = 65; i <= 90; ++i) {
        c = (char) ('A' + ((i + offset - 'A') % 26));
        cout << c << ' ';
    }

    return 0;
}

3 ORIGINAL CHARACTERS A BCDEFGHIJKL MNOPQRSTUVWXYZ ENCRYPTED CHARACTERS DEFGHIJKLMNO PQR STUVWX Y 2 A B C Process finished with exit code O