Global variables and static variables are automatically initialized to zero. If you have simply
char ZEROARRAY[1024];
at global scope it will be all zeros at runtime. But actually there is a shorthand syntax if you had a local array. If an array is partially initialized, elements that are not initialized receive the value 0 of the appropriate type. You could write:
char ZEROARRAY[1024] = {0};
The compiler would fill the unwritten entries with zeros. Alternatively you could use memset to initialize the array at program startup:
memset(ZEROARRAY, 0, 1024);
That would be useful if you had changed it and wanted to reset it back to all zeros
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