Your format specifier is incorrect. From the `printf()` man page on my machine:
>**`0`** A zero '**`0`**' character indicating that zero-padding should be used rather than blank-padding. A '**`-`**' overrides a '**`0`**' if both are used;
>Field Width:
>An optional digit string specifying a *field width*; if the output string has fewer characters than the field width it will be blank-padded on the left (or right, if the left-adjustment indicator has been given) to make up the field width (note that a leading zero is a flag, but an embedded zero is part of a field width);
>Precision: An optional period, '**`.`**', followed by an optional digit string giving a precision which specifies the number of digits to appear after the decimal point, for **e** and **f** formats, or the maximum number of characters to be printed from a string; if the digit string is missing, the precision is treated as zero;
For your case, your format would be `%09.3f`:
#include <stdio.h>
int main(int argc, char **argv)
{
printf("%09.3f\n", 4917.24);
return 0;
}
Output:
$ make testapp
cc testapp.c -o testapp
$ ./testapp
04917.240
Note that this answer is conditional on your embedded system having a `printf()` implementation that is standard-compliant for these details - many embedded environments *do not* have such an implementation.
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