Objective C object properties not working?

Feedback & Bugs
#1

Trying to implement an object class within the same file (as you have to) and come across an error when reading the property. Should be simple:
Note - this works fine in Xcode on my computer.

(Edit: because I’m new I have to change the @ signs to @. because I can’t mention more than 2 users in a post)

@.interface Entity: NSObject
@.property (nonatomic) NSString *name;
@.end

@.implementation Entity
@.end

int main(int argc, const char * argv[]) {
int playerId; // your id (0 to 4)
scanf("%d", &playerId); fgetc(stdin);

// game loop
while (1) {
        Entity *entity = [[Entity alloc] init];
         entity.name = @."test"; //this causes an execption
}

}

Produces an error:

Uncaught exception NSInvalidArgumentException, reason: Entity(instance) does not recognize setName:

This indicates for some reason you can’t assign properties by either object.property = foo or [object setProperty:foo]. Why not?

If I add the method setName: myself (I shouldn’t have to) E.g:

@.interface Entity: NSObject
@.property (nonatomic) NSString *name;

  • (void)setName:(NSString **)name; //have to do double asterisk to escape formatting italic
    @.end

@.implementation Entity

  • (void)setName:(NSString *)name {
    self.name = name;
    }
    @.end

it’s another error:

Uncaught exception NSInvalidArgumentException, reason: Entity(instance) does not recognize name

It’s like it can’t see the property, anyone have any idea how to fix? Thanks for helping.