block

#import <Foundation/Foundation.h>


typedef int (^Myblock)(int, int);

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

    Myblock myblock;
    myblock = ^(int a, int b){
        return a-b;
    };
    
    int sum = myblock(5, 3);
    NSLog(@"%d", sum);
    
    
    return 0;
}

void test2()
{
    int (^sumBlcok)(int, int) = ^(int a, int b){
        return a+b;
    };
    
    int sum = sumBlcok(5, 6);
    NSLog(@"%d", sum);
}


void test()
{
    void (^myblock)() = ^{
        NSLog(@"myblock");
    };
    
    
    myblock();
}