Ch USES the menu function input selection parameters, when the ch=1, produce [- 10, 10] between uniformly distributed random number; When ch=2, produce (- 5, 5) uniformly distributed random number between; When ch=3, produce between [1, 1] is uniformly distributed random number; When ch=4, thus the mean to 0 variance 1 normal distribution random number, requires the use of the switch function,
Big help!!!!!