int a = ({
        int b = 3;
        int c = 4;
        int d = 5;
        b + c + d;
    });
    NSLog(@"6666---%d",a);

6666---12

    UICollectionView *collectionView = ({
        
        collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        collectionView.backgroundColor = [UIColor brownColor];
        collectionView.bounds = CGRectMake(0, 0, kScreenWidth, 200);
        collectionView.center = self.view.center;
        [self.view addSubview:collectionView];

        collectionView.dataSource = self;
        collectionView.showsHorizontalScrollIndicator = NO;
        
        collectionView;
        
    });