新手 求解答 C++ 问题

Question

auto n[]={"\xda\x01\x09\xfc\xca\x98\x82\x33\x69\xaa\xc1\xdf\xbb\x40\x90\xcf",
"\xda\x01\x09\xfc\xca\x98\x82\x33\x69\xaa\xc1\xdf\xbb\x40\x90\xcf",};
auto key=nullptr;

jstring
randomKey(jstring n[] )
{
//生成随机数
srand((unsigned)time((long *)0));
int nlen=rand()%(sizeof(n)/sizeof(n[0]));

return n[nlen];

}

我定义一个 数组,想随机取出来数组中的值,然后赋值给一个变量,我该怎么写呢,刚接触C不懂,求解决

Answer 1

 #include <iostream>
#include <time.h>

using namespace std;


char randomKey(string n[])
{
    srand(time(NULL));
    int nlen = rand() % n[0].length();
    return n[0][nlen];
}
int main()
{
    string n[] = { "\xda\x01\x09\xfc\xca\x98\x82\x33\x69\xaa\xc1\xdf\xbb\x40\x90\xcf",
        "\xda\x01\x09\xfc\xca\x98\x82\x33\x69\xaa\xc1\xdf\xbb\x40\x90\xcf" };
    cout << randomKey(n);
}

C++经典写法