IP 点分四段

#include <iostream>
#include <cstring>

using namespace std;

char * my_strtok(char *p, const char *str)
{
static char *temp;
int i=0;
static int bit;

if(p!=NULL)
temp = p;
else
temp += bit+1;

while(*(temp+i)!=*str && *(temp+i)!='\0')
{
i++;
}

if(*temp=='\0')
{
temp = NULL;
}

bit = i;

if(temp!=NULL)
*(temp+i) = 0;

return temp;
}

int main()
{
char str[30] = {0};
char ptr[30] = {0};

cout << "input str: " ;
cin >> str;
cout << "input ptr: ";
cin >> ptr;

cout << "str: " << str << endl;
cout << "ptr: " << ptr << endl;

char *p = strtok(str, ".");
cout << "first p: " << p << endl;

while((p=(strtok(NULL, "."))) != NULL)
{
cout << p << endl;
}

char *q = my_strtok(ptr, ".");
cout << "first q: " << q << endl;

while((q=(my_strtok(NULL, "."))) != NULL)
{
cout << q << endl;
}

return 0;
}