//UIUC CS125 SPRING 2016 MP. File: CaesarCipher.java, CS125 Project: Challenge3-TopSecret, Version: 2016-02-15T06:55:07-0600.622398463
/**
* A program to search for to encrypt and decrypt lines of text. See
* CaesarCipher.txt
* Hints: line.charAt( int ) is useful.
* You'll need loops, and conditions and variables
* You'll need to read the Test cases to understand how your program should work.
* Good Programming Hints: "DRY: Don't Repeat Yourself"
* Try to make your program as short as possible.
* TODO: add your netid to the line below
* @author kosvick2
*/
public class CaesarCipher {
public static void main(String[] strings) {
boolean done=true;
boolean fun=true;
while(done){
TextIO.putln("Please enter the shift value (between -25..-1 and 1..25)");
int shift = TextIO.getlnInt();
if(shift>=-25 && shift<=25 && shift!= 0) {
TextIO.putln("Using shift value of " +shift);
while(fun){
TextIO.putln("Please enter the source text (empty line to quit)");
String source = TextIO.getln();
if(source.length()==0){
TextIO.putln("Bye.");
fun=false;
done=false;
}
else {
TextIO.putln("Source :"+source);
TextIO.put("Processed:");
source = source.toUpperCase();
char[] decode = source.toCharArray();
for(int i=0; i<source.length(); i++){
if((decode[i] >= 'A') && (decode[i] <= 'Z') && (decode[i]!= ' ')){
decode[i] += shift;
if((((decode[i]-'A')<0) || ((decode[i]-'A')<= 'Z')) && decode[i]!= ' ') {
decode[i]= (char)((decode[i] - 'A' + 26)%26 + 'A');
}
}
TextIO.put(decode[i]);
}
}
}
}
else {
TextIO.putln(shift+ " is not a valid shift value.");
}
}
}
}
