Meaning of expressions like"%d" in c++

[The illusionist mirage]

What is the meaning of expressions like "%d", "%c","%s" in C++

For example, what does the "%d" in the following code fragment stand for?

#include <stdio.h>
  int value = 10;
  printf("%d", value);

Thank You

[vlad from moscow]

It is

a conversion specifier character that specifies the type of conversion to be applied.
d,i The int argument is converted to signed decimal in the style [−]dddd

(the C Standard).

This meaans that value will be outputed as a signed decimal.

[dunnmifflsys]

I typically don't like using %d, but it is used for a placeholder of an integer. %i also works for an integer, %c is a character, and %s is string.