RosettaCodeData/Task/Approximate-equality/FutureBasic/approximate-equality.basic

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local fn DoublesAreApproxEqual( val1 as double, val2 as double, epsilon as double ) as CFStringRef
CFStringRef result = @"false"
if ( fn fabs( val1 - val2 ) < epsilon ) then result = @"true"
end fn = result
void local fn DoIt
long i
double epsilon = 1e-18, values(15)
values(0) = 100000000000000.01 : values(1) = 100000000000000.011
values(2) = 100.01 : values(3) = 100.011
values(4) = 10000000000000.001 / 10000.0 : values(5) = 1000000000.0000001000
values(6) = 0.001 : values(7) = 0.0010000001
values(8) = 0.000000000000000000000101 : values(9) = 0.0
values(10) = fn sqrt(2) * fn sqrt(2) : values(11) = 2.0
values(12) = -fn sqrt(2) * fn sqrt(2) : values(13) = -2.0
values(14) = 3.14159265358979323846 : values(15) = 3.14159265358979324
for i = 0 to 14 step 2
print values(i)@", "values(i+1)@" "fn DoublesAreApproxEqual( values(i), values(i+1), epsilon )
next
end fn
fn DoIt
HandleEvents