could you explain how this declaration of string work ?!

Question

static const char alphanum[] =
"0123456789"
"!@#$%^&*"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz";

Answer 1

normally we define char array as
char []={1,2,3}
but in this case they define it in unfamiliar way

Answer 2

include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

static const char alphanum[] =
"0123456789"
"!@#$%^&*"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz";
int size = sizeof(alphanum) - 1;

int main()
{
//password length

int length = 8;

srand(time(0));
for (int i = 0; i < length; i++)
{
cout << alphanum[rand() % size];
}
return 0;
}

Answer 3

in this program
and it's working