An array of C-strings is two-dimentional array of NULL-terminated strings.
Examine the initialization:

char szSymbols[10][6] = { "INTL", "MSFT", "ORCL", "CSCO", "SANYY" };

Two-dimentional array szSymbols contains NASDAQ symbols that can be 4 or 5 
letters long only. C-arrays are zero-based. Therefore symbols referred as 
szSymbol[0] ... szSymbol[9]. If i - total number of elements in array then 
szSymbol[0] refers to the first element and szSymbol[i-1] to the last. 
The value inside first square brackets in initialization show total number 
of elements in C-string array. The value inside second square brackets gives
length of element plus one for NULL-termination character '\0'.

 
The szSymbols arrays is party initialized. Unlike underinitializing in the
example, overinitializing produces Microsoft compiler error: 'too many 
initializers'. The compiler generates error message 'array bounds overflow'
if C-string element has more then 5 letters.

When number of elements in array is indefinite the following initialization
is used:


char szSymbols[][6] = { "INTL", "MSFT", "ORCL", "CSCO", "SANYY" };

An advantage of the last initialization is that it takes two times less 
memory to allocate: 30 bytes versus 60 bytes for the first type of 
initialization.

Most memory-saving way to initialize array of C-strings is to use array of 
pointers:

char * pszSymbols[] = { "INTL", "MSFT", "ORCL", "CSCO", "SANYY" };

On Windows 2000 each pointer takes 4 bytes. Hence pszSymbols array will
take 20 bytes of memory.