Modified the number of digits to display to ensure correct round-trip.

Author: goualard-f

src/Floatmu.jl

@@ -981,28 +981,31 @@ end
 # Hack to use @printf with a format depending on the `Floatmu` used.
 # Since @printf is a macro, it cannot be called with anything other than a constant
 # for the format string.
-variable_printf(io,x::Floatmu{szE,2}) where {szE} = @printf(io,"%.3g",convert(Float64,x))
+# The number of digits used to display a value is chosen so as to ensure
+# a correct round-trip (``In-and-out conversions'', David Matula,
+# Comm. ACM, 11(1), Jan. 1968) 
+variable_printf(io,x::Floatmu{szE,2}) where {szE} = @printf(io,"%.2g",convert(Float64,x))
 variable_printf(io,x::Floatmu{szE,3}) where {szE} = @printf(io,"%.3g",convert(Float64,x))
 variable_printf(io,x::Floatmu{szE,4}) where {szE} = @printf(io,"%.3g",convert(Float64,x))
 variable_printf(io,x::Floatmu{szE,5}) where {szE} = @printf(io,"%.3g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,6}) where {szE} = @printf(io,"%.3g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,7}) where {szE} = @printf(io,"%.3g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,8}) where {szE} = @printf(io,"%.3g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,9}) where {szE} = @printf(io,"%.4g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,10}) where {szE} = @printf(io,"%.4g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,11}) where {szE} = @printf(io,"%.4g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,12}) where {szE} = @printf(io,"%.4g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,13}) where {szE} = @printf(io,"%.5g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,14}) where {szE} = @printf(io,"%.5g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,15}) where {szE} = @printf(io,"%.5g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,16}) where {szE} = @printf(io,"%.6g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,17}) where {szE} = @printf(io,"%.6g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,18}) where {szE} = @printf(io,"%.6g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,19}) where {szE} = @printf(io,"%.7g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,20}) where {szE} = @printf(io,"%.7g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,21}) where {szE} = @printf(io,"%.7g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,22}) where {szE} = @printf(io,"%.7g",convert(Float64,x))
-variable_printf(io,x::Floatmu{szE,23}) where {szE} = @printf(io,"%.7g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,6}) where {szE} = @printf(io,"%.4g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,7}) where {szE} = @printf(io,"%.4g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,8}) where {szE} = @printf(io,"%.4g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,9}) where {szE} = @printf(io,"%.5g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,10}) where {szE} = @printf(io,"%.5g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,11}) where {szE} = @printf(io,"%.5g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,12}) where {szE} = @printf(io,"%.5g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,13}) where {szE} = @printf(io,"%.6g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,14}) where {szE} = @printf(io,"%.6g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,15}) where {szE} = @printf(io,"%.6g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,16}) where {szE} = @printf(io,"%.7g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,17}) where {szE} = @printf(io,"%.7g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,18}) where {szE} = @printf(io,"%.7g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,19}) where {szE} = @printf(io,"%.8g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,20}) where {szE} = @printf(io,"%.8g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,21}) where {szE} = @printf(io,"%.8g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,22}) where {szE} = @printf(io,"%.8g",convert(Float64,x))
+variable_printf(io,x::Floatmu{szE,23}) where {szE} = @printf(io,"%.9g",convert(Float64,x))
 
 
 function show(io::IO, x::Floatmu{szE,szf}) where {szE, szf}