The difference between C ++ arrays and pointers is a small example!

 

# Include "stdafx. H"

# Include "memory. H"
Void memset_1 (unsigned char * & V1)
{
Unsigned char * pTMP = (unsigned char *) V1;
Memset (pTMP, 100,20 );

}

Int _ tmain (INT argc, _ tchar * argv [])
{
 
Unsigned char * pchar = new unsigned char [20];

Memset (pchar, 0, 20 );
 
Printf ("before memset % d \ n", pchar [1]);
Memset_1 (pchar );

Printf ("after memset % d \ n", pchar [1]);

Delete [] pchar;

Return 0;
}

 

This code runs OK, and the following code runs a compilation error!

Error c2664: "memset_1": parameter 1 cannot be converted from "unsigned char [20]" to "unsigned char *&"

// C_def.cpp: defines the entry point of the console application.
//

# Include "stdafx. H"

# Include "memory. H"
Void memset_1 (unsigned char * & V1)
{
Unsigned char * pTMP = (unsigned char *) V1;
Memset (pTMP, 100,20 );

}

Int _ tmain (INT argc, _ tchar * argv [])
{
 
 
Unsigned char pchar [20];
Memset (pchar, 0, 20 );
 
Printf ("before memset % d \ n", pchar [1]);
Memset_1 (pchar );

Printf ("after memset % d \ n", pchar [1]);

Delete [] pchar;

Return 0;
}

Do you see the difference?