How to convert byte array to hex string array in C

To convert a single byte of the array, you can use 'sprintf()' (http://www.cplusplus.com/reference/clibrary/cstdio/sprintf/) with the '%x' format specifier:

char hex[3];
unsigned char my_byte = 0x42;

sprintf(hex,"%2.2x", my_byte);

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Now all you need to do is to build that into a loop and apply that to each array element consecutively.

When I ran this sample code and try to access hex[3], it is not printing anything and hex[0] is showing as null.
Any better ways?