Printf function

printf() yes C Language standard library functions , Used to output the formatted string to On the screen , The output rule is ：

    1、 When a newline character is encountered , Such as ：

         printf("test printf function one");

         printf("test printf function tow\n");

          After executing this statement ,“test printf function onetest printf function tow” Instantly on the screen .

     2、 The content displayed exceeds 1024 Byte time , Such as ：

           printf(“......”);

          If “......” The total length of Greater than 1024 bytes , Although there is no line break at this time , The displayed content will also be displayed directly on the screen .

     3、 Yes fflush Function time , The displayed content is immediately displayed on the screen , Such as ：

           printf(“test printf function”);

           fflush(stdout);

     4、 Program execution scan When you need to input characters from a standard input device , Such as ：

           printf(“test printf function”);

                ......

           scan(“enter number:%d”,&iNum);

           scan Will cause content to be displayed on the screen .

   5、 At the end of the program , Causes the displayed content to be output to the screen .