华为笔试: 判断两个IP是否为同一网段(c/c++实现)

问题描述：

判断两个Ip是否为同一个网段: Ip1,Ip2分别与子网淹Ip3进行与操作，结果相同则判断为同一个网段，输出结构：1 与操作结果； 否则输出0；

#include 
#include
#include
#define Length 4
using namespace std;

void printIntArray(int * array){
    for ( int i = 0; i < Length; i++ )
        cout << array[i] << "  ";
    cout << endl;
}

int charToInt(char ch, int sum){
    int result = sum * 10 + ( ch - '0' );
    return result;
}

void getIntOfIp(char * ip, int * intArray){
    int count = 0;
    int temp = 0;
    while ( *ip != '\0' ){

        if ( *ip == '.' ){
            intArray[count] = temp;
            count ++;
            temp = 0;    
        }else if ( count == 0 ){
            temp = charToInt(*ip, temp);
        }else if ( count == 1 ){
            temp = charToInt(*ip, temp);
        }else if ( count == 2 ){
            temp = charToInt(*ip, temp);
        }else if ( count == 3 ){
            temp = charToInt(*ip, temp);
        }
        ip++;
    }
    intArray[count] = temp;
}

void ipAndSubIP(int * nums1,int * nums2,int *nums3){
    for ( int i = 0; i < Length; i++ ){
        nums3[i] = nums1[i] & nums2[i];
    }
}

bool compareInt(int * nums1, int * nums2){
    for ( int i = 0; i < Length; i++ ){
        if ( nums1[i] - nums2[i] )
            return false;
    }
    return true;
}

void getFlagToString(int * nums,char * ch){
    int count = 0;
    for ( int i = 0; i < Length; i++ ){
        int num = nums[i];
        int getH = num/100;
        int getM = num / 10 % 10;
        int getL = num % 10;
        if ( getH ){
            ch[count++] = getH + '0';
            ch[count++] = getM + '0';
        } else if ( getM ){
            ch[count++] = getM + '0';
        }
        ch[count++] = getL + '0';
        ch[count++] = '.';
    }
    ch[count-1] = '\0';
}

bool getResult(char *ip1, char * ip2, char * ip3, char * ch){
    // 取出ip的整数值
    int ip1Array[Length],ip2Array[Length],ip3Array[Length],flag1Array[Length], flag2Array[Length];
    getIntOfIp(ip1, ip1Array);
    getIntOfIp(ip2, ip2Array);
    getIntOfIp(ip3, ip3Array);

    ipAndSubIP(ip1Array, ip3Array, flag1Array);
    ipAndSubIP(ip2Array, ip3Array, flag2Array);

    bool result = compareInt(flag1Array, flag2Array);

    if ( result ){
        getFlagToString(flag1Array, ch);
    }
}

int main(void){

    // 输入两个ip, 一个子网言马
    char ip1[13],ip2[13], ip3[13];
    cin >> ip1 >> ip2 >> ip3;

    // 判断ip与子网淹马的&是否相等,不相等输出0； 相等时，输出1, 并输出&后的值
    char ch[13];
    bool result = getResult( ip1 , ip2, ip3, ch);
    if ( result ){
        cout << "1 " << ch << endl;
    }else {
        cout << "0" << endl;
    }
    return 0;
}