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How to find factorial of big numbers such as 100 or higher?
We can do it by implementing our own functions to perform multi-precision arithmetic, or just use any of the freely available libraries for multi-precision arithmetic like GNU Multiple Precision Arithmetic Library∞. GMP is a portable library. For installing this library in Windows compilers, read GMP Install Instruction for Windows Platform∞.
Below is a sample program to find factorial of 100 using the GNU MP library:
#include<stdio.h>
#include<gmp.h> //The GNU MP library header
int main()
{
unsigned long int n=100;
mpz_t fact;
mpz_init(fact);
mpz_fac_ui(fact, n); //Call the library function to find factorial
mpz_out_str(stdout,10,fact);//Print the result stored in fact
return 0;
}
#include<gmp.h> //The GNU MP library header
int main()
{
unsigned long int n=100;
mpz_t fact;
mpz_init(fact);
mpz_fac_ui(fact, n); //Call the library function to find factorial
mpz_out_str(stdout,10,fact);//Print the result stored in fact
return 0;
}
References
GNU MP Online Documentation∞
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