exp2(0) = 1
exp2(-0) = 1
exp2(1e-19) = 1.0000000000000000000693147180559945
exp2(-1e-19) = 0.9999999999999999999306852819440055
exp2(1e-5) = 1.0000069314958283056532090898005617
exp2(-1e-5) = 0.9999930685522169957388034152483014
exp2(1) = 2
exp2(-1) = 0.5
exp2(1e5) = +Inf
exp2(-1e5) = 0
exp2(1e19) = +Inf
exp2(-1e19) = 0
exp2(2e-19) = 1.0000000000000000001386294361119891
exp2(-2e-19) = 0.9999999999999999998613705638880109
exp2(2e-5) = 1.0000138630397022457242368530724583
exp2(-2e-5) = 0.9999861371524789598461215181088435
exp2(2) = 4
exp2(-2) = 0.25
exp2(2e5) = +Inf
exp2(-2e5) = 0
exp2(2e19) = +Inf
exp2(-2e19) = 0
exp2(3e-19) = 1.0000000000000000002079441541679836
exp2(-3e-19) = 0.9999999999999999997920558458320164
exp2(3e-5) = 1.0000207946316221532411978252243363
exp2(-3e-5) = 0.9999792058007855593007648261306387
exp2(3) = 8
exp2(-3) = 0.125
exp2(3e5) = +Inf
exp2(-3e5) = 0
exp2(3e19) = +Inf
exp2(-3e19) = 0
exp2(4e-19) = 1.0000000000000000002772588722239781
exp2(-4e-19) = 0.9999999999999999997227411277760219
exp2(4e-5) = 1.0000277262715883612345149246514526
exp2(-4e-5) = 0.9999722744971364610838521758482311
exp2(4) = 16
exp2(-4) = 0.0625
exp2(4e5) = +Inf
exp2(-4e5) = 0
exp2(4e19) = +Inf
exp2(-4e19) = 0
exp2(5e-19) = 1.0000000000000000003465735902799727
exp2(-5e-19) = 0.9999999999999999996534264097200273
exp2(5e-5) = 1.0000346579596012027369194687362221
exp2(-5e-5) = 0.9999653432415313321788107067817038
exp2(5) = 32
exp2(-5) = 0.03125
exp2(5e5) = +Inf
exp2(-5e5) = 0
exp2(5e19) = +Inf
exp2(-5e19) = 0
exp2(6e-19) = 1.0000000000000000004158883083359672
exp2(-6e-19) = 0.9999999999999999995841116916640328
exp2(6e-5) = 1.0000415896956610107834511898488752
exp2(-6e-5) = 0.9999584120339698395713758454367974
exp2(6) = 64
exp2(-6) = 0.015625
exp2(6e5) = +Inf
exp2(-6e5) = 0
exp2(6e19) = +Inf
exp2(-6e19) = 0
exp2(7e-19) = 1.0000000000000000004852030263919617
exp2(-7e-19) = 0.9999999999999999995147969736080383
exp2(7e-5) = 1.0000485214797681184114582513482268
exp2(-7e-5) = 0.9999514808744516502495912893051392
exp2(7) = 128
exp2(-7) = 0.0078125
exp2(7e5) = +Inf
exp2(-7e5) = 0
exp2(7e19) = +Inf
exp2(-7e19) = 0
exp2(8e-19) = 1.0000000000000000005545177444479562
exp2(-8e-19) = 0.9999999999999999994454822555520438
exp2(8e-5) = 1.0000554533119228586605972635825563
exp2(-8e-5) = 0.9999445497629764312038089908645835
exp2(8) = 256
exp2(-8) = 0.00390625
exp2(8e5) = +Inf
exp2(-8e5) = 0
exp2(8e19) = +Inf
exp2(-8e19) = 0
exp2(9e-19) = 1.0000000000000000006238324625039508
exp2(-9e-19) = 0.9999999999999999993761675374960492
exp2(9e-5) = 1.000062385192125564572833299890598
exp2(-9e-5) = 0.9999376186995438494266891415796626
exp2(9) = 512
exp2(-9) = 0.001953125
exp2(9e5) = +Inf
exp2(-9e5) = 0
exp2(9e19) = +Inf
exp2(-9e19) = 0
