Week 2 HW - Henna

CaesarCipher/CaesarCipher/main.m

@@ -10,42 +10,81 @@
 
 @interface CaesarCipher : NSObject
 
-- (NSString *)decode:(NSString *)string offset:(int)offset;
 - (NSString *)encode:(NSString *)string offset:(int)offset;
+- (NSString *)decode:(NSString *)string offset:(int)offset;
+
+//Being amateur codebreakers, we want to know if two distinct looking ciphers correspond to the same input message. Write a method called codeBreaker, which accepts two cipher strings as paramaters and returns a boolean value which tells us whether they are actually the same input message encoded using two different offsets.
+
+- (BOOL) codeBreaker:(NSString *) string1 with:(NSString *) string2;
 
 @end
 
+
 @implementation CaesarCipher
 
 - (NSString *)encode:(NSString *)string offset:(int)offset {
     if (offset > 25) {
         NSAssert(offset < 26, @"offset is out of range. 1 - 25");
     }
+    NSString *str = [string lowercaseString];
     unsigned long count = [string length];
     unichar result[count];
     unichar buffer[count];
-    [string getCharacters:buffer range:NSMakeRange(0, count)];
-
+    [str getCharacters:buffer range:NSMakeRange(0, count)];
+
+    char allchars[] = "abcdefghijklmnopqrstuvwxyz";
+
     for (int i = 0; i < count; i++) {
         if (buffer[i] == ' ' || ispunct(buffer[i])) {
             result[i] = buffer[i];
             continue;
         }
-
-        int low = islower(buffer[i]) ? 'a' : 'A';
-        result[i] = (buffer[i]%low + offset)%26 + low;
+
+        char *e = strchr(allchars, buffer[i]);
+        int idx= (int)(e - allchars);
+        int new_idx = (idx + offset) % strlen(allchars);
+
+        result[i] = allchars[new_idx];
     }
-
+    
     return [NSString stringWithCharacters:result length:count];
 }
 
 - (NSString *)decode:(NSString *)string offset:(int)offset {
     return [self encode:string offset: (26 - offset)];
 }
+
+- (BOOL) codeBreaker:(NSString *) string1 with:(NSString *) string2{
+
+                                                                            //Loop through offset on first encoded input and decode
+    for (int i = 1; i<25; i++) {
+        NSString * decoded = [self decode:string1 offset:i];
+                                                                            //Loop through offset on second encoded input and decode
+        for (int j = 1; j < 25; j++) {
+            NSString * decoded2 = [self decode:string2 offset:j];
+
+            if ([decoded isEqualToString:decoded2]) {
+                NSLog(@"%@ = '%@', offset: %d", string1, decoded, i);
+                NSLog(@"%@ = '%@', offset: %d", string2, decoded2, j);
+                return YES;
+            }
+
+        }
+
+    }
+
+    return NO;
+
+}
+
 @end
 
+
 int main(int argc, const char * argv[]) {
     @autoreleasepool {
-
+
+        CaesarCipher *decrypt = [[CaesarCipher alloc] init];
+        [decrypt codeBreaker:@"okmg" with:@"tprl"];
+
     }
-}
+}

Person/Person/main.m

@@ -19,11 +19,18 @@ - (NSString *)city;
 - (void)setPhoneNumber:(NSString *)phoneNumber;
 - (NSString *)phoneNumber;
 
+- (void)changePersonsName:(Person *) aPerson
+                   toName:(NSString *) newName;
+
+- (BOOL)checkSameCity:(Person *) name;
+
+- (Person*)registerChild;
+
 @end
 
 @implementation Person {
-    NSString *_name;
-    NSString *_phoneNumber;
+    NSString *_name;            //can be access from anywhere in your class -- might have to be selective later
+    NSString *_phoneNumber;     //can't be accessed from instance variable?
     NSString *_city;
 }
 
@@ -51,13 +58,67 @@ - (NSString *)phoneNumber {
     return _phoneNumber;
 }
 
+- (void)changePersonsName:(Person *) aPerson toName:(NSString *) newName{
+
+    [aPerson setName:newName];
+
+}
+
+- (BOOL)checkSameCity:(Person *) name{
+
+    if ([[name city] isEqualToString:[self city]]) {
+        return YES;
+    }
+    else{
+        return NO;
+    }
+
+}
+
+- (Person*)registerChild{
+    Person* child = [[Person alloc]init];
+    [child setPhoneNumber:[ self phoneNumber]];
+    [child setCity: [self city]];
+
+    return child;
+
+}
+
 @end
 
 
 int main(int argc, const char * argv[]) {
     @autoreleasepool {
-        // insert code here...
-        NSLog(@"Hello, World!");
+
+        Person *Henna = [[Person alloc]init];   //allocates memory and initializes a Person object
+        [Henna setName: @"Henna"];
+        [Henna setCity: @"New York"];
+        [Henna setPhoneNumber: @"7187777777"];
+
+        Person *Bob = [[Person alloc]init];
+        [Bob setName: @"Bob"];
+        [Bob setCity: @"New Jersey"];
+        [Bob setPhoneNumber: @"7187777778"];
+
+        Person *Clara = [[Person alloc]init];
+        [Clara setName: @"Clara"];
+        [Clara setCity: @"New York"];
+        [Clara setPhoneNumber: @"7187774778"];
+
+        BOOL hennaAndClara = [Henna checkSameCity:Clara];
+        BOOL claraAndBob = [Clara checkSameCity:Bob];
+
+        NSLog(@"%d %d", hennaAndClara, claraAndBob);
+
+
+        //A Person has recently had a child, whose name is 'Abc'. Write a method called registerChild which takes 0 parameters and returns a new Person * instance represeting the child, which has the same phoneNumber and city as the parent.
+
+        Person *Abc = [Henna registerChild];
+        [Abc setName:@"Abc"];
+        NSLog(@"%@'s baby, %@, lives in %@ and it's phone number is %@", [Henna name], [Abc name], [Abc city], [Abc phoneNumber]);
+
+
+
     }
     return 0;
 }

README.md

@@ -42,3 +42,6 @@ Write a program to simulate an election. Create a class called **VotingSimulator
 4. Ask the ElectionManager to ***initiatePolling***
 5. Follow the instructions on the console. After each round of polling you will be asked(within the console) whether you want to continue or not.
 6. Ask the ElectionManager to ***displayResults***
+
+
+comment for branch