C语言解析ipv4
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2024-03-12 22:12:14
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// parseiP.cpp : 定义控制台应用程序的入口点。
//
include “stdafx.h”
include
include
include
pragma warning(disable:4996)
using namespace std;
define isip(a) ((a)>=0&&(a)<=255)
//返回n的二进制
void f(int n)
{
if (n)
f(n / 2);
else
return;
printf(“%d”, n % 2);
}
int main()
{
char *aa = “011”;
char dd = 5 + '0';
int cd = atoi(aa);
printf("%c\n", dd);
system("pause");
int n = 5;
f(n);
map<int, char*>aa1;
pair<int, char*> cc = make_pair(2, const_cast<char*>("cc"));
aa1.insert(cc);
char *ip = "192.168.0.33";
int a=0, b=0, c=0, d=0;
char bip[32] = { 0 };
if (sscanf(ip, "%d.%d.%d.%d", &a, &b, &c, &d) == 4)
{
if (isip(a) && isip(b) && isip(c) && isip(d))
{
printf("%d\n", a);
itoa(a, bip, 2);
f(a);
printf("%s\n", bip);
printf("%d\n", b);
printf("%d\n", c);
printf("%d\n", d);
printf("%u", a << 24 | b << 16 | c << 8 | d);
goto end;
}
else
goto error;
}
else
goto error;
error:
printf(“format error.”);
return -1;
end:
system(“pause”);
return 0;
}