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+---
+language: Objectiv-C
+author: Eugene Yagrushkin
+author_url: www.about.me/yagrushkin
+filename: learnc.Objectiv-C
+---
+
+Objective-C is the main programming language used by Apple for the OS X and iOS operating systems and their respective APIs, Cocoa and Cocoa Touch.
+It's is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. 
+
+```Objective-C
+// Single-line comments start with //
+
+/*
+Multi-line comments look like this.
+*/
+
+##Basic types
+// all the primitive variable types are the same as in C
+// char, int, long, double, float
+
+
+// Simple, common classes
+// number
+NSNumber *firstNumber = @1;
+NSNumber *secondNumber = @23.0;
+NSNumber *boolNumber = @YES; 
+
+// string
+NSString *aString = @"some string";
+
+// array
+NSArray *array = @[ @1, @2];
+
+// dictionary
+NSDictionay *dictionary = @{ @"aKey" : @"aValue", @"aKey2" : @"aValue2" };
+
+// Import headers with #import
+#import <UIKit/UIKit.h>
+#import "SomeAppDelegate.h"
+
+##Coding classes
+
+// Declare your class in a header(.h) file:
+
+@interface UserObject : NSObject{
+// instance variables
+}
+
+// Class method
+	+ (NSString*) ClassMethod;
+
+// Instance method
+	- (NSString*) instanceMethodWithParmeter:(NSString*)string;
+
+@end
+
+// Add class methods in an implementation (.m) file:
+
+@implementation UserObject
+
++ (NSString*) ClassMethod{
+	return @"SomeString";
+}
+
+- (NSString*) instanceMethodWithParmeter:(NSString*)string;
+{
+	return @"New string";
+}
+
+- (NSString*) otherMethodWithString:(NSString*)string;
+{
+	return [NSString stringWithString:string];
+}
+@end
+
+// Create an object instance by allocating memory and initializing it. An object is not fully functional until both steps have been completed.
+UserObject *someObject = [[UserObject alloc] init];
+
+##Calling Methods
+
+// The Objective-C model of object-oriented programming is based on message passing to object instances. 
+// In Objective-C one does not simply call a method; one sends a message.
+
+[someObject instanceMethodWithParmeter:@"Steve Jobs"];
+
+##Nested Messages
+// nested messages look like this:
+
+[someObject instanceMethodWithParmeter:[someObject otherMethodWithString:@"Jony Ive"]];
+
+```
+## Further Reading
+
+[Wikipedia Objective-C](http://en.wikipedia.org/wiki/Objective-C)
+
+[Objectively Speaking: A Crash Course in Objective-C](http://www.raywenderlich.com/12444/objectively-speaking-a-crash-course-in-objective-c)
+
+[iOS For High School Students: Getting Started](http://www.raywenderlich.com/5600/ios-for-high-school-students-getting-started)