block outer var use

gistfile1.m

float price = 1.99;

float (^finalPrice)(int) = ^(int quantity)
{
  // Notice local variable price is 
  // accessible in the block
  return quantity * price;
};

int orderQuantity = 10;
NSLog(@"Ordering %d units, final price is: $%2.2f", orderQuantity, finalPrice(orderQuantity));