Why is the result here constantly 41 if it is meant to produce random numbers?

Question

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

int main()
{

cout << rand();
// Outputs 16

return 0;
}

Answer 1

Add these:
#include <ctime>

Before use rand:
srand(time(0));

No idea why, random numbers are annoying in C++

Answer 2

this code with some comment might help a little,

srry no comments were there but basically I m using input age as a seed value to produce a specific random no. for that age

https://code.sololearn.com/cYh9VfKXfbfC/?ref=app

Answer 3

That gave random numbers, thanks. Is this using time to randomize?