alloc problem

hello.m

#import <objc/Object.h>
#import <stdio.h>

@interface Number: Object
{
@public
    int number;
}

- (void) printNum;
- (id) init;
@end

/////////////////////////////////////

@implementation Number: Object
- (void) printNum {
    printf("%d\n", number);
}

- (id) init{
    self = [ super init ];
    if (self) {
        number = 0;
    }
    return self;
}

@end

int main(void)
{
    //Number *myNumber = [Number new]; //[ Number new ]; // equal to [[Number alloc] init]
    Number *myNumber = [Number alloc];
    myNumber = [myNumber init];
    printf("lsajfks\n");
    myNumber->number = 6;
    [myNumber printNum];
    return 0;
}