Problem with rand()

[orestisman]

I used the function rand(), of the library <cstdlib>, to generate a random number and everytime I run it it returns 41.

#include<iostream>
#include<cstdlib>
using namespace std;
int main(){
cout<<rand();

return 0;
}

What's the problem?

Post scriptum: I have now run it on an online compiler and it always returns 1804289383.

[JLBorges]

Seed the random number generator, once at the beginning of the program.
There is an example on this page: http://en.cppreference.com/w/cpp/numeric/random/srand

[orestisman]

Thank you JLBorges, it worked.