What is the purpose of format specifier “%qd” in `printf()`?

Question

I saw format specifier %qd when browsing github code. Then I checked in GCC compiler, it\'s working fine.

#include 

int main()
{  
          


        

Answer 1

q means quad word format specifier in printf function which is used to handle 64 bits comfortably on all machines.

From Wikipedia:

Additionally, several platform-specific length options came to exist prior to widespread use of the ISO C99 extensions:

…

q - For integer types, causes printf to expect a 64-bit (quad word) integer argument. Commonly found in BSD platforms