Error when mulplying floats

Using Arduino Programming Questions
1

Hi all.
I am puzzled about this issue.

the code below:

  
 float myfloat1=0.001;
 float myfloat2=0.1;
 float mytotal=myfloat1*myfloat2;
 Serial.println(String(mytotal));

returns a '0.00'. Instead of '0.0001

Can anyone explain this?
Regards

2

Because when you converted it to String you didn't tell it how many decimals to keep. The default is two.

Try this instead:

float myfloat1=0.001;
 float myfloat2=0.1;
 float mytotal=myfloat1*myfloat2;
 Serial.println(mytotal , 4);
2 Likes
3

Floats are similarly printed as ASCII digits, defaulting to two decimal places.

From:

4

Thank you.
regards

5

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