实验

include <stdio.h>

include <stdlib.h>

include <string.h>

include <openssl/bn.h>

define MAX_PRIME 1000

int main()
{
BIGNUM *product, *prime;
char *str;
int i;

// 初始化大数库
BN_CTX *ctx = BN_CTX_new();
product = BN_new();
prime = BN_new();
str = BN_bn2dec(product);
BN_set_word(product, 1);

// 计算1000以内素数的乘积
for (i=2; i<=MAX_PRIME; i++) {
    int is_prime = 1;
    int j;
    for (j=2; j*j<=i; j++) {
        if (i % j == 0) {
            is_prime = 0;
            break;
        }
    }
    if (is_prime) {
        BN_set_word(prime, i);
        BN_mul(product, product, prime, ctx);
    }
}

// 输出结果
str = BN_bn2dec(product);
printf("1000以内素数的乘积为: %s\n", str);

// 释放内存
BN_free(prime);
BN_free(product);
BN_CTX_free(ctx);
free(str);

return 0;

}