typedef int (^MyBlock) (int , int);

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        MyBlock sumBlock = ^(int a , int b){

            return  a + b;

        };

        int i = sumBlock(2,3);

        NSLog(@"%d",i);

        MyBlock avgBlock = ^(int a , int b){

            return (a + b) / 2;

        };

        int k = avgBlock(10,30);

        NSLog(@"%d",k);

    }

    return 0;

}