clearing a char array c

I thought by setting the first element to a null would clear the entire contents of a char array. char my_custom_data[40] = "Hello!"; my_custom_data[0] = '\0'; However, this only sets the first element to null. or my_custom_data[0] = 0; rather than use `memset`, I thought the 2 examples above should clear all the data.
Jared, why did you set the c++ tag? he talked about "C" and did not add any C++ related tags.

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