oc里面都是采用对象:
NSNumber *num = @123;
NSLog(@"%@",num); //把123存到num里面
NSNumber *num1 =[[NSNumber alloc] initWithInt:123];
NSNumber *num3 =[NSNumber numberWithInt:123];
NSString *str1 = @"i"; NSString *str2 = @"love"; NSString *str3 = @"you"; NSString *str = [str1 stringByAppendingFormat:@".%@.%@",str2 ,str3]; //将字符str1 str2 str3连接以 . ; NSLog(@"%@",str); NSString *fp = @"/users/apple/Desktop/test.plist"; [str writeToFile:fp atomically:YES encoding:NSUTF8StringEncoding error:NULL]; //将str存到 /users/apple/Desktop/test.plist NSString *str4 = [NSString stringWithContentsOfFile:fp encoding:NSUTF8StringEncoding error:NULL]; //将str读出来 NSArray *p = [str4 componentsSeparatedByString:@"."]; //以‘.‘分开; oc字符数组 p; NSLog(@"%@", p );
初学objective c语言6 number string
原文：http://www.cnblogs.com/studylove/p/3524472.html