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-rw-r--r--objective-c.html.markdown63
1 files changed, 41 insertions, 22 deletions
diff --git a/objective-c.html.markdown b/objective-c.html.markdown
index 2b8e9874..284eca92 100644
--- a/objective-c.html.markdown
+++ b/objective-c.html.markdown
@@ -29,33 +29,52 @@ int main (int argc, const char * argv[])
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
// Use NSLog to print lines to the console
- NSLog(@"Hello World!"); // Print "Hello World!"
+ NSLog(@"Hello World!"); // Print the string "Hello World!"
- // character literals
+ // String object
+ NSString *worldString = @"World";
+ // %@ is an object
+ NSLog(@"Hello %@!", worldString); // Print "Hello World!"
+
+ // Character literals
NSNumber *theLetterZ = @'Z';
+ NSLog(@"%c", [theLetterZ charValue]);
- // integral literals
- NSNumber *fortyTwo = @42;
- NSNumber *fortyTwoUnsigned = @42U;
- NSNumber *fortyTwoLong = @42L;
- NSNumber *fortyTwoLongLong = @42LL;
-
- // floating point literals
- NSNumber *piFloat = @3.141592654F;
- NSNumber *piDouble = @3.1415926535;
+ // Integral literals
+ NSNumber *fortyTwoNumber = @42;
+ int fortyTwo = [fortyTwo intValue];
+ NSLog(@"%i", fortyTwo);
+
+ NSNumber *fortyTwoUnsignedNumber = @42U;
+ unsigned int fortyTwoUnsigned = [fortyTwoUnsigned unsignedIntValue];
+ NSLog(@"%u", fortyTwoUnsigned);
+
+ NSNumber *fortyTwoLongNumber = @42L;
+ long fortyTwoLong = [aLong longValue];
+ NSLog(@"%li", fortyTwoLong);
+
+ // Floating point literals
+ NSNumber *piFloatNumber = @3.141592654F;
+ float piFloat = [piFloat floatValue];
+ NSLog(@"%f", piFloat);
+
+ NSNumber *piDoubleNumber = @3.1415926535;
+ piDouble = [piDouble doubleValue];
+ NSLog(@"%f", piDouble);
// BOOL literals
- NSNumber *yesNumber = @YES; // equivalent to [NSNumber numberWithBool:YES]
- NSNumber *noNumber = @NO; // equivalent to [NSNumber numberWithBool:NO]
-
- // strings
- NSString *helloString = @"hello";
-
- // array
- NSArray *anArray = @[@1, @2];
-
- // dictionary
- NSDictionay *aDictionary = @{ @"key1" : @"value1", @"key2" : @"value2" };
+ NSNumber *yesNumber = @YES;
+ NSNumber *noNumber = @NO;
+
+ // Array object
+ NSArray *anArray = @[@1, @2, @3, @4];
+ NSNumber *thirdNumber = anArray[2];
+ NSLog(@"Third number = %@", thirdObject); // Print "Third number = 3"
+
+ // Dictionary object
+ NSDictionary *aDictionary = @{ @"key1" : @"value1", @"key2" : @"value2" };
+ NSObject *valueObject = aDictionary[@"A Key"];
+ NSLog(@"Object = %@", valueObject); // Print "Object = (null)"
// Clean up the memory you used into your program
[pool drain];