method to convert an IP address to an int type using Java code _java

Basic points of knowledge

ip--> integer:
Converts an IP address into an array of bytes
Convert to int by left shift (<<), with (&), or (|)
Integer--> IP:
The integer value is shifted to the right (>>>), 24 digits to the right, and the operator (&) 0xFF, and the resulting number is the first segment of IP.
The integer value is shifted to the right (>>>), 16 digits to the right, and the operator (&) 0xFF, and the resulting number is the second segment of IP.
The integer value is shifted to the right (>>>), 8 digits to the right, and the operator (&) 0xFF, and the resulting number is the third segment of IP.
The integer value is performed with the operator (&) 0xFF, and the resulting number is the fourth segment IP.

Ideas
IP address to int type, for example, IP is "192.168.1.116", equivalent to "." The IP address is divided into 4 parts, each part corresponding to the weight value of 256^3, 256^2, 256, 1, can be

int type to IP address, thinking similar, divided by weight, but with partial string operation

Code

  #include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> #d 
   
  Efine LEN typedef unsigned int uint; 
   
    /** * String reshaping/UINT Iptint (char *ipstr) {if (ipstr = NULL) return 0; 
    Char *token; 
   
    UINT i = 3, total = 0, cur; 
   
    token = strtok (Ipstr, "."); 
      while (token!= NULL) {cur = atoi (token); 
      if (cur >= 0 && cur <= 255) {total = cur * POW (256, i); 
      } I--; 
    token = strtok (NULL, "."); 
  Return to total; 
   
    /** * Inverse string/void Swapstr (char *str, int begin, int end) {int I, J; 
        for (i = begin, j = end; I <= J; i + +, J-) {if (Str[i]!= str[j]) {str[i] = Str[i] ^ str[j]; 
        STR[J] = Str[i] ^ str[j]; 
      Str[i] = Str[i] ^ str[j]; /** * Reshaping the IP String */char* Iptstr (UINT ipint) {char *new = (char *) malloc (LEN); 
    memset (New, ' n ', LEN '); 
    New[0] = '. '; 
    Char token[4]; 
   
    Int bt, ed, Len, cur; 
      while (ipint) {cur = ipint% 256; 
      sprintf (token, "%d", cur); 
      strcat (new, token); 
      Ipint/= 256; 
    if (ipint) strcat (New, "."); 
    Len = strlen (new); 
   
    Swapstr (new, 0, len-1); for (bt = ed = 0; ed < Len;) {while (Ed < Len && New[ed]!= '. ') 
      {ed + +; 
      } swapstr (New, BT, ED-1); 
      ed = 1; 
    BT = Ed; 
   
    } new[len-1] = '; 
  return new; 
    int main (void) {char ipstr[len], *new; 
   
    UINT Ipint; 
      while (scanf ("%s", Ipstr)!= EOF) {ipint = Iptint (IPSTR); 
   
      printf ("%u\n", ipint); 
      New = Iptstr (Ipint); 
    printf ("%s\n", new); 
  return 0; 

 }