os NSNumber NSDate Usage

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#import <Foundation/Foundation.h>int main (int argc, const char * argv[]) {    NSNumber *number = [NSNumber numberWithFloat:3.141592];NSLog(@"%d",[number intValue]);NSLog(@"%@",[number stringValue]);//NSDateNSLog(@"\n");NSLog(@"NSDate usage=====");NSDate *date = [NSDate date];//[NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:5.0f]];//NSLog(@"Slept %f seconds" , [[NSDate date] timeIntervalSinceDate:date]);//NSLog(@"%@" ,[date description]);NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];formatter.dateFormat = @"/MM/dd/YY HH:mm:ss";NSString *timestamp =[formatter stringFromDate:date];NSLog(@"%@",timestamp);//add 100 secondsdate = [NSDate dateWithTimeIntervalSinceNow:180.0f];timestamp = [formatter stringFromDate:date];NSLog(@"%@",timestamp);return 0;}

Console

2012-08-27 12:45:24.019 object_02[1244:1307] 3
2012-08-27 12:45:24.024 object_02[1244:1307] 3.141592
2012-08-27 12:45:24.026 object_02[1244:1307]
2012-08-27 12:45:24.027 object_02[1244:1307] NSDate usage=====
Running…
2012-08-27 12:45:24.034 object_02[1244:1307] /08/27/12 12:45:24
2012-08-27 12:45:24.036 object_02[1244:1307] /08/27/12 12:48:24