difference between ARC and MRC

Question

I am confused with Apple material.

In 3 ways we manage the memory, they are :

1. automatic referance counting.
2. manual reference counting.
3. garbage colletion.

My doubt is what is the difference between automatic reference counting and manual referance counting.

Can someone explain me ?

Answer 1

In ARC you don't have to release/autorelease the memory allocated by you where as in case of manual you have to take care of this. e.g. manual case

-(void)someMethod
{ 
    NSMutableArray *arr = [[NSMutableArray alloc] init];
    //use array
    [arr release]; //when array is in no use
}

ARC case

-(void)someMethod
{
    NSMutableArray *arr = [[NSMutableArray alloc] init];
    //use array
}