## zero_illinois_test.jl
#
#  Discussion:
#
#    Use the Illinois method to find a root of a nonlinear equation.
#
#  Licensing:
#
#    This code is distributed under the MIT license.
#
#  Modified:
#
#    14 March 2024
#
#  Author:
#
#    John Burkardt
#
include( "../zero_illinois/zero_illinois.jl" )
include( "../timestamp/timestamp.jl" )

print( "\n" )
timestamp( )
print( "\n" )
print( "zero_illinois_test():\n" )
print( "  Julia version\n" )
print( "  Test zero_illinois(), which uses the Illinois method to find a\n" )
print( "  root of an equation f(x) = 0, starting with a change of\n" )
print( "  sign interval.\n" )

f(x) = x^5 - 2
zero_illinois( f, 0.5, 1.5 )

print( "\n" )
print( "zero_illinois_test():\n" )
print( "  Normal end of execution.\n" )
timestamp( )