Objective C Class and Object example, Objective-C

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//gcc 5.0.4

#import <Foundation/Foundation.h>

@interface Book : NSObject
{
    NSString *title;
    NSString *author;
    int price;
    int weight;
}
-(void)setTitle:(NSString *)btitle setAuthor:(NSString *)bauthor;
-(void)setPrice:(int)bprice;
-(void)setWeight:(int)bweight;
-(void)getBookDetails;
-(void)resellPrice:(int)bweight;

@end
    
@implementation Book
    
    float priceperpaper = 5.3, resellprice;

-(id) init
{
    self = [super init];
    title = @"Profession iOS Book";
    author = @"ABC Author";
    price = 100;
    weight = 1000;
}

-(void)setTitle:(NSString *)btitle setAuthor:(NSString *)bauthor
{
    title = btitle;
    author = bauthor;
}

-(void)setPrice:(int)bprice
{
    price=bprice;
}

-(void)setWeight:(int)bweight
{
    weight=bweight;
}

-(void)getBookDetails
{
    NSLog(@"Book \nTitle : %@ \nAuthor:%@, \nPrice:%d, \nWeight:%d",title,author,price,weight);
}

-(void)resellPrice:(int)bweight
{
    weight=bweight;
    resellprice = weight / priceperpaper;
    NSLog(@"Resell Price = %f",resellprice);
}
@end
    
int main (int argc, const char * argv[])
{
    Book *b1 = [[Book alloc] init];
          
    [b1 getBookDetails];
    
    [b1 setTitle:@"Vachnamrut" setAuthor:@"P.Muktanand Swamiji"];
    [b1 setPrice:120];
    [b1 setWeight:500];
    [b1 getBookDetails];
    [b1 resellPrice:500];
    
    return 0;
}

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Compilation time: 0.33 sec, absolute running time: 0.11 sec, cpu time: 0.06 sec, memory peak: 9 Mb, absolute service time: 0,45 sec