Block

- (void)viewDidLoad {
    [super viewDidLoad];
   
    //block
    void(^myBlock)(void)  = ^(void) {
        NSLog(@"This is a block without parameter and returned value");
    };
    myBlock();
}

- (void)viewDidLoad {
    [super viewDidLoad];
   
    //block
    void(^myBlock)(void)  = ^ {
        NSLog(@"This is a block without parameter and returned value");
    };
    myBlock();
}

-(void)blockWithParameterButNoReturnData
{
    void(^myBlock)(int) = ^(int num) {
        NSLog(@"%d",num*100);
    };
    myBlock(4);
}

-(void)blockWithParameterAndReturnValue
{
    int (^myBlock)(int) = ^(int num) {
        return num * 100;
    };
   int result =  myBlock(2);
    NSLog(@"This is a block with parameter and return value :%d",result);
}

-(void)testBlock
{
    void(^blockOne)(void) = ^ {
        NSLog(@"This is block one");
    };
    int c = 10;
    void(^blockTwo)(void) =^(void) {
        NSLog(@"This is a block two %d",c);
    };
    void(^blockThree)(void) =[blockTwo copy];
    NSLog(@"blockOne address is :%@",blockOne);
    NSLog(@"blockTwo address is :%@",blockTwo);
    NSLog(@"blockThree address is :%@",blockThree);
}