JeOam

#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
    @autoreleasepool {
        NSLog(@"Programming is fun");
	NSLog(@"Fun Fun");
    }
    return 0;
}

JeOam

Type                      Constant Examples                    NSLog chars
char                      'a','\n'                             %c
short int                 -                                    %hi, %hx, %ho
unsigned short int        -                                    %hu, %hx, %ho
int                       12, -97, oxFFE0, 0177                %i, %x, %o
unsigned int              12u, 100u, 0Xffu                     %u, %x, %o
unsigned long int         12UL, 100ul, 0xffeeUL                %li, %lx, %lo
long long int             0xe5e5e5e5LL, 500ll                  %lli, %llx, %llo
unsigned long long int    12ull, oxffeeull                     %llu, %llx, %llo
float                     12.34f, 3.1e-5f, 0x1.5p10, 0x1p-1    %f, %e, %g, %a

JeOam

Method                                                                     Quesstion or Action
-(BOOL) isKindofClass: class-object                                        Is the object a member of class-object or a descendant?
-(BOOL) isMemberofClass: class-object                                      Is the object a member of class-object?
-(BOOL) respondsToSelector: selector                                       Can the object respond to the method specified by selector?
+(BOOL) instancesRespondToSelector: selector                               Can instances of the specified class respon to selector?
+(BOOL) isSubclassofClass: class-object                                    Is the object of a subclass of the specified class?
-(id) performSelector: selector                                            Apply the method specified by selector
-(id) performSlector: selector withObject: object                          Apply the method specified by selector passing the argument object
-(id) performSelector: selector w

JeOam

@try{
	//some codes
}
@catch (NSException *exception){
        NSLog(@"Caught %@%@", exception.name, exception.reason);
}

JeOam

initWithArray:
initWithArray:copyItems:
initWithContentsofFile:
initWithContentsofURL:
initWithObjects:
initWithObjects:count:

JeOam

enum month { january = 1, february, march, april, may, june, july, august, september, october, november, december };
enum month thisMonth;
thisMonth = february;

JeOam

#ifdef conditon
    #define A  B
#else
    #define C  D
#endif

#undef E

JeOam

(struct date){ .month=7, .day=2, year=2011}

JeOam

Creation and Initialization    Initialization Instance Method    Retrieval Instance Method
numberWithChar:                initWithChar:                     charValue
numberWithUnignedChar:         initWithUnsignedChar:             unsignedCharValue
numberWithShort:               initWithShort:                    shortValue
numberWithUnsignedShort:       initWithUnsignedShort:            unsignedShortVlaue
numberWithInteger:             initWithInteger:                  integerValue
numberWithUnsignedInteger:     initWithUnsignedInteger:          unsignedIntegerValue
numberWithInt:                 initWithInt:                      intValue
numberWithUnsignedInt:         initWithUnsignedInt:              unsignedIntValue
numberWithLong:                initWithLong:                     longValue

JeOam

Method                                                         Description
+(id) stringWithContentsofFile:path encoding:enc error:err     Creates a new string and sets it to the path contents
                                                               of a file specified by the path using character encoding env, 
                                                               returning error in err if non-nil

+(id) stringWithContentsofURL:url encoding:enc error:err       Creates a new string and sets it to the contents of url
                                                               using character encoding enc, 
                                                               returning error in err if non-nil

+(id) string                                                   Creates a new empty string