%u is an unsigned integer of 10 followed by a format string. \n means line feed.

% u \ Used to print format statements, such as printf, sprint, vsprintf, fprintf, etc.

Example:

printf("%u\n "， 19)；

The output is

19 & lt； CR & gt

& ltCR & gt is also the broken line sign.

Extended data

Defining unsigned integers in c language

Classification of int; Eger variable: basic integer: int short integer: shortint；; Long integer: longint adds the modifier unsigned to the above three categories, specifying an "unsigned number". If the modifier signed is added, specify "signed number"; If neither signed nor unsigned is specified, it means it is signed. Examples are as follows:

What is the output of the following code?

unsignedinta= 1，intb =-2；

intc =-2；

cout & lt& ltb & lt& ltendl

if(a+c & gt； 0)

cout & lt& lta+b & lt； & ltendl