恺撒密码,达人进来指点

[MAOGE1987]

刚学C++不久,对这个密码算法编了个程序,但结果不对.希望有个达人能知道下,是不是要用指针指向才得...谢谢
#include <iostream>
using namespace std;
int main()
{
int i;
cout << "\n请输入加密密码：";
cin >> i;
char a;
cout << "\n请输入明文：\t";
cin >> a;
cout << "\n密文是：\t";
while(a != '\n')
{
if((a <= 'z' && a >= 'a') || ( a <= 'Z' && a >='A'))
{
cout<<char(a+i);
if(a == ' ')
cout << " ";
}
return 0;
}
}

[独孤过儿]

#include <iostream>
using namespace std;
int main()
{
	int i;
	cout  << "\n请输入加密密码：";
    cin >>  i;
	char a;
	cout  << "\n请输入明文：\t";
	cin >>  a;
	cout  << "\n密文是：\t";
	while(a != '$')    //输入$结束
	{
		if((a  <= 'z' && a >= 'a')|( a  <= 'Z' && a >='A'))
		{ 
			cout << char(a+i);
		   if(a == ' ')
			cout  << " ";
		}
		cout  << "\n请输入明文：\t";
		cin >>  a;
	}
	return 0;
} 

[MAOGE1987]

#include <iostream>
using namespace std;
int main()
{
int i;
cout << "\n请输入加密密码：";
cin >> i;
char a;
cout << "\n请输入明文：\t";
cin >> a;
cout << "\n密文是：\t";
while(a != '\n')
{
if((a<='z'&&a>='a')||( a<='Z'&&a>='A'))
cout <<char(a+i);
if(a == ' ')
cout << " ";
a = cin.get();
}
return 0;
}
修改过了,但程序不健全,还是要修改下,再加其他情况了

[hslinux]

#include <iostream>
using namespace std;
int main()
{
int i;
cout << "\n请输入加密密码：";
cin >> i;
char a[256]={0};
cout << "\n请输入明文：";
cin >> a;
cout << "\n密文是：";
int j = 0;
while(a[j] != '$' && j<256) //输入$结束
{
if((a[j] <= 'z' && a[j] >= 'a')|( a[j] <= 'Z' && a[j] >='A'))
{
cout << char(a[j]+i);
if(a[j] == ' ')
cout << " ";
}
++j;
}
cout << endl;
return 0;
}

[paidfighting]

你的不就是对的么？

[MAOGE1987]

改过了,但是程序不健全而已,帖个完整的
#include <iostream>
using namespace std;
int main()
{
int i;
cout << "\n请输入加密密码：";
cin >> i;
char b,c,a;
cout << "\n请输入明文：\t";
cin>>a;

b = char('z' - i%26);
c = char('Z' - i%26);
cout << "\n密文是：\t";
while(a != '\n')
{
if((a <= 'z' && a >= 'a') || ( a <= 'Z' && a >='A'))
{ if((a <= b && a >= 'a') || ( a <= c && a >='A'))
cout << char(a + i%26);
if(a > c && a <= 'Z')
cout << char(a + i%26 - 26);
if(a > b && a <= 'z')
cout << char(a + i%26 - 26);
if(a == ' ')
cout << " ";
}
else
cout << a;
a = cin.get();
}
return 0;
}

[MAOGE1987]

自己给自己给分了...哎

[独孤过儿]

恩？我不是给你改了吗？