Convert a Float to a string

CountMurphy

I am having what I hope is a very simple issue to work out. I have a couple functions what are doing some float math, I would like to output the results of said functions onto my computer's serial terminal. To do so I am using the FloatString Object to convert one of my floats to a string. If I have a float of 1357.4999

serial.str(fs.FloatToString(1357.4999))

prints out "1357.5".

Even if I call the SetPrecision function, my output is being incorrectly rounded. Is there a way to convert my exact float to a string? Coming from a c++ c# world, this has been very frustrating. I think I've spent more time trying to cast variables then writting code for my project. Any help would be greatly appreicated.

lonesock

Not really. The floating point format only has 24 bits of precision (23, plus the leading 1), which only nets you 7 decimal places. It's the compiler casting your number to the floating point format that is losing precision.

Jonathan

CountMurphy

Ok, this isn't that bad. My float formats are always ####.####. I might be able to get away with using ints for the math. Thanks for help

Duane Degn

If you decide to use integer math and you use a muliplier to move the decimal portion to up into the integer portion, you can use this method to display the integer with a decimal point added to the appropriate location.