random_shuffle not really random

Question

I\'m using the random_shuffle on a vector like this:

#include 
vector  deck;
//some code to add cards to the deck h         


        

Answer 1

Place the line:

srand (time (0));

in your code before you do anything else, such as at the start of main().

Without that, the default seed of 1 will always be used, leading to identical sequences from rand() and anything that uses it.