1                 //格式化输出字符串
 2                 string word = "world";
 3                 string test = string.Format("hello {0}", word);
 4 
 5                 //格式化输出数字
 6                 int num = 100;
 7                 string myNum = string.Format("myNum={0}", num);
 8 
 9                 //格式化输出时间
10                 DateTime nowTime = DateTime.Now;
11                 string currentDate = string.Format("nowTime={0}", nowTime);

1         //格式化字符串
2         NSString * world=@"world";
3         NSLog(@"hello %@",world);
4 
5         //格式化一个整数
6         int num=2;
7         NSLog(@"%d",num);