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float to array

 
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Joined: 28 Jul 2014
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float to array
PostPosted: Wed Apr 29, 2020 12:37 pm     Reply with quote
How can i convert a float into a char array ?

For example if i have a float val=779.324 how this can be converted and stored in a array ?
jeremiah



Joined: 20 Jul 2010
Posts: 1353

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PostPosted: Wed Apr 29, 2020 1:11 pm     Reply with quote
You can use sprintf() to "print" the float to a string, but you have to ensure the character array is long enough to hold the result + null character.
Quote:

sprintf( )

Syntax:
sprintf(string, cstring, values...);
bytes=sprintf(string, cstring, values...)

Parameters:
string - is an array of characters.
cstring - is a constant string or an array of characters null terminated.
values - are a list of variables separated by commas. Note that format specifies do not work in ram band strings.

Returns:
Bytes is the number of bytes written to string.

Function:
This function operates like printf() except that the output is placed into the specified string. The output string will be terminated with a null. No checking is done to ensure the string is large enough for the data. See printf() for details on formatting



Code:

char str[20];
sprintf(str,"%f",val);



I have also provided a "poorman's" version of snprintf() if you want to tell the function the size of your character array to avoid overrunning memory:

https://www.ccsinfo.com/forum/viewtopic.php?t=53652&highlight=snprintf

Code:

#include "snprintf.h"

...

char str[20];
snprintf(str,20,"%f",val);
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