To solve this kata requires a gift of telepathy. You have to guess which of the possible answers the author believes to be the right one.

Maybe I find strange function in C and С++ test cases
long lrand() {
srand(time(0));
return (((long) rand() << 0) & 0x00000000FFFFFFFFull) |
(((long) rand() << 32) & 0xFFFFFFFF00000000ull);
}
It return long long instead long. As RAND_MAX = 2^31-1 it may be replaced to
long lrand() {
srand(time(0));
return (long) rand() ;
}

You can view my solution. if delete line with printf C random test crashed.
This is second, simplified solution. About first solution in next post.

For C and C++ random test behaves unpredictable.

This kata demonstrates JS power. 7 lines solution is impressive after C++.

For JS 0<=Math.random()<1