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#include <stdio.h>
#include <stdio.h>
#include <cs50.h>
#include <cs50.h>
#include <string.h>
#include <string.h>
#include <ctype.h>
#include <ctype.h>
#include <math.h>
#include <math.h>
void EncryptLower(int key, char i);
void EncryptLower(int key, char i);
void EncryptUpper(int key, char i);
void EncryptUpper(int key, char i);
int WhichArray(char* keyword, int CharNum);
int WhichArray(char* keyword, int CharNum);
int main(int argc, string argv[])
int main(int argc, string argv[])
{
{
if (argc != 2)
if (argc != 2)
{
{
printf("Please enter one key after ./vigenere\n.");
printf("Please enter one key after ./vigenere\n.");
return 1; // Make sure that 2 arguments are passed into the program else exit and return 1 as error message
return 1; // Make sure that 2 arguments are passed into the program else exit and return 1 as error message
}
}
char* keyword = argv[1]; // Assign the key into a variable
//char* keyword = argv[1]; // Assign the key into a variable
//if (isalpha(keyword) != true) // Check that the key is all letters
//if (isalpha(keyword) != true) // Check that the key is all letters
//{
//{
// return 1; // Exit program
// return 1; // Exit program
//}
//}
char* message = GetString(); // Store the message
string message = GetString(); // Store the message
int z = strlen(message);
//int z = strlen(message);
//int shift[z];
int shift[strlen(argv[1])];
for(int a = 0, n = strlen(keyword); a < n; a++) //Go through the characters of the key and create an array of keys to use
for(int a = 0, n = strlen(argv[1]); a < n; a++) //Go through the characters of the key and create an array of keys to use
{
{
if(isupper(keyword[a]))
if(isupper(argv[1][a]))
{
{
int shift[n] = keyword[a] - 65; // populate the array with an index to encrypt with
shift[a] = argv[1][a] - 65; // populate the array with an index to encrypt with
}
}
else if(islower(argv[1][a]))
else if(islower(keyword[a]))
{
{
int shift[n] = keyword[a] - 97; // populate the array with an index to encrypt with
shift[a] = argv[1][a] - 97; // populate the array with an index to encrypt with
}
}
}
}
for(int i = 0, x = strlen(message); i < x; i++) // for first to last character
for(int i = 0, x = strlen(message); i < x; i++) // for first to last character
{
{
if(isalpha(message[i])) // Check if the value is a character
if(isalpha(message[i])) // Check if the value is a character
{
{
if(islower(message[i])) // check if the value is lowercase
if(islower(message[i])) // check if the value is lowercase
{
{
int key0 = shift [WhichArray(keyword, i)]; // which array will find which number of array to pull this should work.
int key0 = shift [WhichArray(argv[1], i)]; // which array will find which number of array to pull this should work.
EncryptLower(key0, message[i]);
EncryptLower(key0, message[i]);
}
}
else if(isupper(message[i])) //check if the the value is uppercase
else if(isupper(message[i])) //check if the the value is uppercase
{
{
int key1 = shift [WhichArray(keyword, i)];
int key1 = shift [WhichArray(argv[1], i)];
EncryptUpper(key1, message[i]);
EncryptUpper(key1, message[i]);
}
}
}
}
else
else
{
{
printf("%c", message[i]); // Not sure if this will work, print any charcter not encrypted eg. a number or brackets
printf("%c", message[i]); // Not sure if this will work, print any charcter not encrypted eg. a number or brackets
}
}
}
}
printf("\n");
printf("\n");
return 0;
return 0;
}
}
void EncryptLower(int key, char i) // Encrypt Lowercase letters
void EncryptLower(int key, char i) // Encrypt Lowercase letters
{
{
int cipher = ((i + key - 97) % 26) + 97; //encrypt the char
int cipher = ((i + key - 97) % 26) + 97; //encrypt the char
printf("%c", cipher); // print the encrypted char
printf("%c", cipher); // print the encrypted char
}
}
void EncryptUpper(int key, char i) // Encrypt the uppercase letters
void EncryptUpper(int key, char i) // Encrypt the uppercase letters
{
{
int cipher = ((i + key - 65) % 26) + 65; // encrypt the char
int cipher = ((i + key - 65) % 26) + 65; // encrypt the char
printf("%c", cipher); // print the encrypted char
printf("%c", cipher); // print the encrypted char
}
}
int WhichArray(char* keyword, int CharNum) // Find out which array to go into, CharNum is the character number in the string
int WhichArray(char* keyword, int CharNum) // Find out which array to go into, CharNum is the character number in the string
{
{
int x = CharNum % strlen(keyword);
int x = CharNum % strlen(keyword);
return x;
return x;
}
}