using namespace std;
int main()
{
int i, x;
char str[100];
cout << "Please enter a string:\t";
cin >> str;
cout << "\nPlease choose following options:\n";
cout << "1 = Encrypt the string.\n";
cout << "2 = Decrypt the string.\n";
cin >> x;
//using switch case statements
switch(x)
{
//first case for encrypting a string
case 1:
for(i = 0; (i < 100 && str[i] != '\0'); i++)
str[i] = str[i] + 2; //the key for encryption is 3 that is added to ASCII value
cout << "\nEncrypted string: " << str << endl;
break;
//second case for decrypting a string
case 2:
for(i = 0; (i < 100 && str[i] != '\0'); i++)
str[i] = str[i] - 2; //the key for encryption is 3 that is subtracted to ASCII value
cout << "\nDecrypted string: " << str << endl;
break;
default:
cout << "\nInvalid Input !!!\n";
}
return 0;
}
