Sizing Memory Q.

Suppose I declare a variable as:

char Str[100];

Does it make any difference which of the following I use for initializing the array?

memset(Str, 0, sizeof(Str));

vs.

memset(Str, 0, sizeof(char * 100));

I have been using method number 1 a lot lately and didn't know if there was some down side that I'm just not aware of.

The first is better for an array.

>>char Str[100];
>>for initializing the array
Also:
char str[100] = {0};
will initialise it all to 0