[memo] C++ 英文加密ASCII

#include <iostream>
#include <cstdlib>

using namespace std;

int main()
{
char arr[100];
gets(arr);
int i=0;
while (arr[i] !=0)
{
if (arr[i]>='A'&&arr[i]<='Z' || arr[i]>='a'&&arr [i]<='z')
cout << arr[i]+3;//将ASCII码加三
if (arr[i]>='0'&&arr[i]<='9')
cout << arr[i]-3;
i++;
}
system("pause");
return 0;
}