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Additive.cpp
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Additive.cpp
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#include<iostream>
#include<math.h>
#include "Chars.h"
std::string Encryption(std::string plainText, int key);
std::string Decryption(std::string cipherText, int key);
int main(void){
int key = 15;
std::string plainText = "Hello",cipherText;
plainText = lowerCase(plainText);
cipherText = Encryption(plainText,key);
std::cout<<"Encryption: "<<cipherText<<'\n';
std::cout<<"Decryption: "<<Decryption(cipherText,key)<<'\n';
return 0;
}
std::string Encryption(std::string plainText, int key){
std::string cipherText;
for(auto p : plainText){
int n = (Chars[p] + key);
while(n < 0)
n += 26;
cipherText += findChar(n % 26);
}
return cipherText;
}
std::string Decryption(std::string cipherText, int key){
std::string plainText;
for(auto c : cipherText){
int n = (Chars[c] - key);
while(n < 0)
n += 26;
plainText += findChar(n % 26);
}
return plainText;
}