www.pudn.com > pppcode.rar > test.c

#include "notation.h" 
typedef struct { 
BYTE SourceIP [4]; 
BYTE DestinationIP [4]; 
WORD SourcePort; 
WORD DestPort; 
BYTE LengthUpper; 
BYTE Length; 
WORD Checksum; 
BYTE Payload[54]; 
} UDPDatagram; 
void main() 
{ 
UDPDatagram *pt1; 
pt1->SourceIP[0]=1; 
pt1->DestinationIP[0]=pt1->SourceIP[0]; 
}