c - double to char* without any external methods -


i trying convert double precision number in c char* array, cannot use methods such sprintf or outside of stdlib library. trying have mathematical approach find number of digits + dot sign , put each digit int array, hard when precision high, 102.45555

any ideas on how can achieved?

you can go in approach:

cast double int, store digits of int in char array append decimal point subtract int double while don't have sufficient number of digits after decimal point:     multiply double 10     cast int , append array     subtract int double

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