simple3.apb

Pascal Programs Printed in GENETIC ALGORITHMS IN SEARCH, OPTIMIZATION, AND MACHINE LEARNING by Da

program simple3;
{ simple3: a program to flip 20 coins and keep track of heads and tails }
{          use for-do construct                                         }

const ncoins = 20;         { number of coin flips }
      probability = 0.5;   { probability of heads turning up }

var   heads_or_tails:array[1..2] of integer; { heads/tails count }
      j:integer;                             { loop counter }
      toss:boolean;                          { toss: true=heads, false=false }

{ Include random number generator and flip routine }
{$I random.apb}

begin { Main program }
 heads_or_tails[1] := 0;        { Counters to zero }
 heads_or_tails[2] := 0;
 randomize;                     { Seed and warm up random number generator }
 for j := 1 to ncoins do begin  { Coin toss loop }
   toss := flip(probability);
   if toss then heads_or_tails[1] := heads_or_tails[1] + 1
     else heads_or_tails[2] := heads_or_tails[2] + 1
  end; { coin toss loop }
 writeln(' In ', ncoins, ' coin tosses there were ',
           heads_or_tails[1], ' heads and ', heads_or_tails[2],
           ' tails')
end. { Main program }