root/trunk/ProjectFortress/tests/BigNum.fss

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component BigNum
export Executable

factorial(n:ZZ32):ZZ
    requires {n >= 0}
    = if n = 0 then big(1)
    else (factorial (n-1)) n
    end

run(args:String...):()=do
  x:ZZ = 1934791870947204798109283471902037419
  y:ZZ = big(1)
  assert (x+y ,1934791870947204798109283471902037420, "BigNum + doesn't work") 
  assert (factorial(5), 120, "factorial(5)=120")
  assert (factorial(30) DIV factorial(29), 30, "factorial test failed") 
end

end