华为OJ题目（八）：字符串加解密

#include<iostream>
#include<string>
using namespace std;

void Encrypt(char aucPassword[], char aucResult[]);//声明函数
int unEncrypt(char result[], char password[]);

int main()
{
char aucPassword[100], aucResult[100], result[100], password[100];
//cin >> aucPassword;
//cin >> result;
gets(aucPassword);
gets(result);

Encrypt(aucPassword, aucResult);//调用函数
unEncrypt(result, password);
cout << aucResult << endl;
cout << password << endl;
return 0;
}
void Encrypt(char aucPassword[], char aucResult[])
{
int len = strlen(aucPassword);
for (int i = 0; i < len + 1;i++)
{
if (aucPassword[i] >= 'a'&& aucPassword[i]<'z') //小写字母时加密
aucPassword[i] = aucPassword[i] - 31;
else if (aucPassword[i] >= 'A'&& aucPassword[i]<'Z') //大写字母
aucPassword[i] = aucPassword[i] + 33;
else if (aucPassword[i] == 'Z') //特殊情况
aucPassword[i] = 'a';
else if (aucPassword[i] == 'z')
aucPassword[i] = 'A';
else if (aucPassword[i] >= '0'&& aucPassword[i]<'9') //数字
aucPassword[i] = aucPassword[i] + 1;
else if (aucPassword[i] == '9') //数字特殊情况
aucPassword[i] = '0';
}
strcpy(aucResult, aucPassword); //把从aucPassword地址开始且含有'\0'结束符的字符串复制到以aucResult开始的地址空间

}
int unEncrypt(char result[], char password[])
{
int len = strlen(result);
for (int i = 0; i<len + 1; i++)
{
if (result[i]>'a'&& result[i] <= 'z') //小写字母时解密(加密逆过程)
result[i] = result[i] - 33;
else if (result[i]>'A'&& result[i] <= 'Z') //大写字母
result[i] = result[i] + 31;
else if (result[i] == 'A') //特殊情况
result[i] = 'z';
else if (result[i] == 'a')
result[i] = 'Z';
else if (result[i]>'0'&& result[i] <= '9') //数字
result[i] = result[i] - 1;
else if (result[i] == '0') //数字特殊情况
result[i] = '9';
}
strcpy(password, result);
return 0;
}