#include<stdio.h>
#define uchar unsigned char
#define uint unsigned int
uchar bin1num(uchar num);
void main() {
	uchar IP[] = {192,168,1,53};	//IP地址
	uchar SubnetMask[] = {255,255,255,224};	//子網掩碼
	//網絡類型和默認子網掩碼縮寫
	uchar DefaultSubnetMaskAbbr;
	if(IP[0]<224) DefaultSubnetMaskAbbr = 24;	//C類地址
	if(IP[0]<192) DefaultSubnetMaskAbbr = 16;	//B類地址
	if(IP[0]<128) DefaultSubnetMaskAbbr = 8;	//A類地址
	//實際子網掩碼縮寫：二進制中1的個數
	uchar SubnetMaskAbbr = bin1num(SubnetMask[0])+bin1num(SubnetMask[1])+bin1num(SubnetMask[2])+bin1num(SubnetMask[3]);
	//網絡地址：IP & 子網掩碼
	uchar Network[] = {IP[0] & SubnetMask[0], IP[1] & SubnetMask[1], IP[2] & SubnetMask[2], IP[3] & SubnetMask[3]};
	//廣播地址：(~子網掩碼)|網絡地址
	uchar Broadcast[] = {(~SubnetMask[0])|Network[0], (~SubnetMask[1])|Network[1], (~SubnetMask[2])|Network[2], (~SubnetMask[3])|Network[3]};
	//子網數：2^(實際子網掩碼縮寫-默認子網掩碼縮寫)
	uint SubnetNum = 1;
	for(int i=0; i<SubnetMaskAbbr-DefaultSubnetMaskAbbr; i++) {
		SubnetNum *=2;
	}
	//最大主機數：2^(32-子網掩碼縮寫)
	uint HostNum = 1;
	for(int i=0; i<32-SubnetMaskAbbr; i++) {
		HostNum *=2;
	}
	/*打印結果*/
	printf("ip地址：%d.%d.%d.%d\n", IP[0], IP[1], IP[2], IP[3]);
	printf("子網掩碼：%d.%d.%d.%d\n", SubnetMask[0], SubnetMask[1], SubnetMask[2], SubnetMask[3]);
	if(DefaultSubnetMaskAbbr==8) printf("網絡類型：A類\n");
	if(DefaultSubnetMaskAbbr==16) printf("網絡類型：B類\n");
	if(DefaultSubnetMaskAbbr==24) printf("網絡類型：C類\n");
	printf("子網掩碼縮寫：%d\n", SubnetMaskAbbr);
	printf("網絡地址：%d.%d.%d.%d\n", Network[0], Network[1], Network[2], Network[3]);
	printf("廣播地址：%d.%d.%d.%d\n", Broadcast[0], Broadcast[1], Broadcast[2], Broadcast[3]);
	printf("子網數：%d\n", SubnetNum);
	printf("最大主機數：%d\n", HostNum);
	printf("可用主機數：%d\n", HostNum-2);
}
//計算8位二進制數1的個數(1必須從第一位開始，每個1必須相鄰)
uchar bin1num(uchar num) {
	uchar Divisor[] = {128,64,32,16,8,4,2,1};	//除數(8位)
	uchar Remainder = num;	 //余數
	uchar ret;	//結果
	for(ret=0; ret<10; ret++) {
		if(Remainder>0) Remainder = Remainder%Divisor[ret];
		else break;
	}
	return ret;
}