NSString *type = @"hello";

NSString *subtype = @"good";

NSString *typesub = [NSString stringWithFormat:@"%@>%@",type,subtype];

NSString *typesub1 = [type stringByAppendingString:subtype];

NSString *typesub2 = [type stringByAppendingFormat:@"%@>%@",subtype];

NSString *a= @"abc" ;

NSString *typesub3 = [type stringByAppendingFormat:@"%@>%@>%@",subtype,a];

NSLog(@"%@,%@,%@",typesub,typesub1,typesub2,typesub3,typesub3);