How to make your own data type like int, long in C?

Question

I'm beginner in c and I want to create my own data type which I can use like int but to store bigger numbers. For example, how can I allocate memory for this data type with malloc?

Answer 1

Read some C programming book about struct-ures, union-s, pointers, and data types. Read more about C dynamic memory allocation

To deal with big numbers, you'll better use some bignum (a.k.a. arbitrary-precision arithmetic) library, such as GMPlib. So your question becomes implementation and operating system specific.

^{Notice that bignum arithmetic involves tricky and difficult algorithms (better than naive approaches).}

You should become more fluent about programming in C before using it (GMPlib). Be afraid of undefined behavior and memory leaks.