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history_source/信息学奥赛一本通/1.5.3.9.cpp

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+#include<iostream>
+#include<string>
+using namespace std;
+void turn1(string &n)
+{
+	for(int i=0;i<n.size();i++)
+	{
+		if(n[i]>='a'&&n[i]<='z') n[i]=n[i]-32;
+		else if(n[i]>='A'&&n[i]<='Z') n[i]=n[i]+32;
+	}
+}
+void turn2(string &n)
+{
+	char li;
+	for(int i=0,j=n.size()-1;i<j;i++,j--)
+	{
+		li=n[i];
+		n[i]=n[j];
+		n[j]=li;
+	}
+} 
+void turn3(string &n)
+{
+	for(int i=0;i<n.size();i++)
+	{
+		if(n[i]>='a'&&n[i]<='z')
+		{
+			if(n[i]<='w') n[i]+=3;
+			else n[i]-=23;
+		}
+		else
+		{
+			if(n[i]<='W') n[i]+=3;
+			else n[i]-=23;
+		}
+	}
+} 
+int main()
+{
+	string a;
+	cin>>a;
+	turn1(a);
+	turn2(a);
+	turn3(a);
+	cout<<a<<endl;
+	return 0;
+}
+