How to calculate large factorial number in C ?

• gmp-wasm

  38 12 10.0 C

  Fork of the GNU Multiple Precision Arithmetic Library (GMP), suitable for compilation into WebAssembly.

  

Because, depending on the architecture, your unsigned long might not be long enough to hold 19!. A 64-bit unsigned long would be sufficient, but a 32-bit would not be. You could try uint64_t instead (use #include ), or, if that isn't sufficient, use an arbitrary-precision library like GMP.

• tiny-bignum-c

  2 409 0.0 C

  Small portable multiple-precision unsigned integer arithmetic in C

Large? Factorials get very large very quickly. Do you need pointers to a bignum library? https://github.com/kokke/tiny-bignum-c

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