Objective-C description method

Description Method of objective-C:
All objects in Java have the string tostring () method inherited from the object, which is used to obtain the string representation of the object,
The method signature for this method in objective-C is:

-(Nsstring *) description;

Because this is a member method in nsobject, we do not have to declare it in the fraction. h file.
Implementation in fraction. m is as follows:

-(Nsstring *) Description

{
Return @ "I Am a fraction! ";
}
Write main function access:

Int main (INT argc, const char * argv [])

{
Fraction * frac = [[fraction alloc] initwithnumerator: 2 anddenominator: 3];
Nslog (@ "% @", frac );
Return 0;
}

Here we can see that the formatted string used for the nslog output object is% @The description method is called..
If we do not implement our own description, we will call the nsobject implementation to output the first address of the object.