Simulation for Google interview question about having girls until you have a boy

gistfile1.ps1

# Problem:
# In a country in which people only want boys every family continues to have children until they have a boy. 
# If they have a girl, they have another child. If they have a boy, they stop. 
# What is the proportion of boys to girls in the country?

$global:m=0; $global:f=0;

function havebabiesuntilboy(){ 
  while($true){ 
    if ((Get-Random -Minimum 0 -Maximum 2) -eq 1)
    {
      #write-host "boy"
      $global:m++; break;
    }
    else{
      #write-host "girl"
      $global:f++;
    }
  }
}
1..100000 | % { havebabiesuntilboy}
# This runs iteratively, but it could run in parallel. It's a simulation so it doesn't matter to the math.
# However, it is a nice simply stated problem that would make a good example for a map/reduce styled solution.
# I leave that as an exercise to the reader.
write-host ("{0:P2}" -f ($m/($f+$m))) "percent male"
write-host ("{0:P2}" -f ($f/($f+$m))) "percent female"