Added the Caesar Cipher to the program

SourceFiles/Caesar.cpp

@@ -0,0 +1,127 @@
+//Ciphers/SourceFiles/Caesar.hpp
+//Matthew Ellison
+// Created: 4-25-18
+//Modified: 4-25-18
+//This file contains the implementation of the Caesar class
+//This class implements the Caesar Cipher and is inteded to be turned into a library
+
+
+#include "../Headers/Caesar.hpp"
+#include <string>
+#include <cctype>
+
+
+//std::string input;
+//std::string output;
+//int shift;
+
+Caesar::Caesar(){
+	shift = 0;
+}
+
+Caesar::~Caesar(){
+}
+
+void Caesar::setInput(std::string inputString){
+	input = inputString;
+}
+
+std::string Caesar::getInput() const{
+	return input;
+}
+
+void Caesar::setShift(int shiftAmount){
+	//If you shift more than 26 you will just be wrapping back around again
+	shift = shiftAmount % 26;
+}
+
+int Caesar::getShift() const{
+	return shift;
+}
+
+std::string Caesar::getOutput() const{
+	return output;
+}
+
+std::string Caesar::encode(){
+	output = "";
+	char temp;	//A temperary holder for the current working character
+	for(int cnt = 0;cnt < input.size();++cnt){
+		temp = input.at(cnt);
+		//If it is a upper case letter shift it and wrap if necessary
+		if(isupper(temp)){
+			temp += shift;
+			//Wrap around if the letter is now out of bounds
+			if(temp < 'A'){
+				temp += 26;
+			}
+			else if(temp > 'Z'){
+				temp -= 26;
+			}
+		}
+		//If it is a lower case letter shift it and wrap if necessary
+		else if(islower(temp)){
+			temp += shift;
+			//Wrap around if the letter is now out of bounds
+			if(temp < 'a'){
+				temp += 26;
+			}
+			else if(temp > 'z'){
+				temp -= 26;
+			}
+		}
+		//If it is whitespace, number, or punctuation just let it pass through
+		//Add it to the output string
+		output += temp;
+	}
+	return output;
+}
+
+std::string Caesar::encode(int shiftAmount, std::string inputString){
+	setShift(shiftAmount);
+	setInput(inputString);
+	return encode();
+}
+
+std::string Caesar::decode(){
+	output = "";
+	char temp;
+	for(int cnt = 0;cnt < input.size();++cnt){
+		temp = input.at(cnt);
+		//If it is an upper case letter shift it and wrap if necessary
+		if(isupper(temp)){
+			temp -= shift;
+			if(temp < 'A'){
+				temp += 26;
+			}
+			else if(temp > 'Z'){
+				temp -= 26;
+			}
+		}
+		//If it is a lower case letter shift it and wrap if necessary
+		else if(islower(temp)){
+			temp -= shift;
+			if(temp < 'a'){
+				temp += 26;
+			}
+			else if(temp > 'z'){
+				temp -= 26;
+			}
+		}
+		//If it is whitespace, number, or punctuation just let it pass through
+		//Add it to the output string
+		output += temp;
+	}
+	return output;
+}
+
+std::string Caesar::decode(int shiftAmount, std::string inputString){
+	setShift(shiftAmount);
+	setInput(inputString);
+	return decode();
+}
+
+void Caesar::reset(){
+	input = output = "";
+	shift = 0;
+}