clearing a char array c

Question

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] = \         


        

Answer 1

You should use memset. Setting just the first element won't work, you need to set all elements - if not, how could you set only the first element to 0?