Random integers : rand

rand takes as argument an integer n or no argument.

• rand(n) returns a random integer p such that 0 $\leq$ p < n.
  Input :
  rand(10)
  Output for example :
  8

• rand() returns a random integer p such that 0 $\leq$ p < 2³¹ (or on 64 bits architecture 0 $\leq$ p < 2⁶³).
  Input :
  rand()
  Output for example :
  846930886