The function of conversion between network address and binary number in C language _c language

C language Inet_ntoa () function: Converts the number of network binaries into network addresses
header file:

 #include <sys/socket.h>  #include <netinet/in.h>  #include <arpa/inet.h>

To define a function:

char * INET_NTOA (struct in_addr in);

Function Description: Inet_ntoa () is used to convert the number of network binary digits in the parameter in to the network address, and then returns a pointer to this network address string.

Return value: Returns a string pointer to success and returns NULL if it fails.

C language Inet_aton () function: To convert the network address into a network binary number
header file:

#include <sys/scoket.h>  #include <netinet/in.h>  #include <arpa/inet.h>

To define a function:

int Inet_aton (const char * cp, struct in_addr *INP);

Function Description: Inet_aton () is used to convert the network address string referred to in the parameter CP to a binary number used by the network, and then to be stored in the IN_ADDR structure referred to in the parameter INP.

The structure in_addr is defined as follows

struct in_addr
{
  unsigned long int s_addr;
};

Return value: Success returns a non 0 value, and a failure returns 0.

C language inet_addr () function: The number that converts the network address into binary
header file:

#include <sys/socket.h>  #include <netinet/in.h>  #include <arpa/inet.h>

To define a function:

unsigned long int inet_addr (const char *CP);

Function Description: inet_addr () is used to convert the network address string that the parameter CP refers to into the binary digits used by the network. A network address string is a string of numbers and dots, for example: "163. 13.132. 68 ".

Return value: Success returns the number of the corresponding network binary, failure returns-1.