How to convert strings to double

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1

hi,

 

i am using areduino and i am reading a file from sd card then i get two string values and use in another fuction which need double to be parsed. so is it possible to convert strings to double ? if so let me know.

2

double val = atof(“22.67”)

double val = atof(“22.67”) ;

I believe works on Arduino.  I remember strtod(…) as well in standard C++, but not sure is supported for the gcc compiler.

Regards,

Bill

3

i am using ide 1.0.5. let me

i am using ide 1.0.5. let me explain bit deeply about my situation.

I am reading an SD card content from arduino UNO and the file is a .txt file which contains GPS lat and lon. i read line by line and output as a string. example 3.535355 in a String lat.

Since i am using tinygpsplus it use double to calculate distance and stuff so i need to feed a double not a string.

so will the above solutions will work for me? your deep support is needed and appriciate any help. :slight_smile:

4

avr-libc reference

Here is a link to avr-libc reference.

http://www.nongnu.org/avr-libc/user-manual/index.html

Regards

Palou

5

do i need to include this

do i need to include this library or its built in?