sub_cipher.cpp

#include<iostream>
//#include<array>
#include<cstdlib>
#include<fstream>
#include<ctime>
#include<chrono>

using namespace std;
char alphabets[27] = { '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',' ' };

//create an array of numbers 0 to 25
int numbers[27] = { '@','7','1','#','$','9','0','6','!','*','(',')','~','^','8','&','/','3',';','<','2','5','?','[','4',']',' ' };
char* encrypt(char* msg, int total_msg, char* cip, int  total_cip);
char* decrypt(char* cip, int total_cip, char* pln, int  total_pln);

int main() {
    //create an array of alphabets a to z


    char message[1000] = { '\0'};
    char cipher[1000] = { '\0' };
    char plain_text[1000] = { '\0' };

    cout << "Enter the message to be encrypted: ";
    cin.getline(message, 1000);
    //encrypting the message
    encrypt(message, 1000, cipher, 1000);
    cout << "The encrypted message is: " << cipher  << endl;
    decrypt(cipher, 1000, plain_text, 1000);
    cout << "The decrypted message is: " << plain_text << endl;
    return 0;
}

char* encrypt(char * msg,  int total_msg,char *  cip, int  total_cip) {
    for (int i = 0; i < total_msg; i++) {
        if (msg[i] == '\0') {
            break;
        }
        for (int j = 0; j < 27; j++) {
            if (msg[i] == alphabets[j]) {
                cip[i] = numbers[j];
                break;
            }
        }
    }
    return cip;
}

char* decrypt(char* cip, int total_cip, char* pln, int  total_pln) {
    for (int i = 0; i < total_cip; i++) {
        if (cip[i] == '\0') {
            break;
        }
        for (int j = 0; j < 27; j++) {
            if (cip[i] == numbers[j]) {
                pln[i] = alphabets[j];
                break;
            }
        }
    }

    return pln;
}