windows下的安装配置：https://blog.csdn.net/u012629110/article/details/51220727

使用：

添加头文件：
#include <gmpxx.h>

编译必须链接相应的库：
g++ mycxxprog.cc -lgmpxx -lgmp -o mycxxprog

(1)gmp整数操作：
mpz_class a,b,c;
mpz_gcd (a.get_mpz_t(), b.get_mpz_t(), c.get_mpz_t();

(2)Random state means an algorithm selection and current state data. The C data type for such
objects is gmp_randstate_t.
gmp_randstate_t rstate;

(3)把字符串初始化为gmp大整数：
“int mpz_init_set_str(mpz_t rop, char*str, int base);

释放空间：void mpz_clear(mpz_t rop);//声明了一个变量，在程序的最后一定要释放，不然会报错

加法：void mpz_add(mpz_t rop, mpz_t op1, mpz_t op2); //rop = op1 + op2

减法：void mpz_sub(mpz_t rop, mpz_t op1, mpz_t op2); //rop = op1 - op2

乘法：void mpz_mul(mpz_t rop, mpz_t op1, mpz_t op2); //rop = op1 * op2

除法：void mpz_cdiv_q (mpz_t q, mpz_t n, mpz_t d); //q = n/d,这个有很多种类型，具体的看使用手册

幂运算：void mpz_pow_ui (mpz_t rop, mpz_t base, unsigned long int exp); //rop = base^exp

开方：void mpz_sqrt (mpz_t rop, mpz_t op); //rop = op开方的向下取整