//
//  main.m
//  mylearn
//

//

#import <Foundation/Foundation.h>
@interface Mypoint:NSObject
-(void) print;
-(void) setx:(int)x;
-(void) sety:(int)y;
@end

@implementation Mypoint
{
    int myx;
    int myy;
}
-(void) print{
    NSLog(@"(%i,%i)",myx,myy);
}
-(void)setx:(int)x{
    myx=x;
}
-(void)sety:(int)y{
    myy=y;
}

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        Mypoint *mypoint;
        mypoint=[Mypoint alloc];
        [mypoint setx:10];
        [mypoint sety:20];
        NSLog(@"point:");
        [mypoint print];
    }
    return 0;
}

2016-09-01 12:01:00.732 mylearn[822:97355] point:

2016-09-01 12:01:00.733 mylearn[822:97355] (10,20)