Storing very large number in C programming

Question

I want to store very large number suppose Avogadro's number which is 6.022*10^23. Even long double overflows when i try to store it. In Python it is quite easy as it will just store any data type and will not show any error.
Any help is appreciated 😁 !

Answer 1

Unfortunately, you must use an external library:
https://wikipedia.org/wiki/List_of_arbitrary-precision_arithmetic_software

In C++ the job could be easier if you use an "header only" extension: there are 2 or 3 around.