要么自己实现大数运算 要么用大数库 举个栗子
程序代码：
#include <iostream>
#include <gmp.h>
#include <gmpxx.h>
using std::cout;
using std::cin;
using std::endl;
int main(void)
{
unsigned long n = 1;
cin >> n;
mpz_class result(1);
mpz_fac_ui(result.get_mpz_t(), n);
cout << result << endl;
return 0;
}
编译参数
g++ -Wall -march=corei7-avx -Ofast -msse4.2 -mavx -std=c++11 a.cpp -lgmp -lgmpxx -lm -o a
运行
100
93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000
2014-06-28 11:53
