delete pics to save space

history_source/ccf 入门篇/U4/4.2.6.cpp

@@ -0,0 +1,21 @@
+#include<iostream>
+#include<cmath>
+#include<string>
+using namespace std;
+int main()
+{
+	string a;
+	char f;
+	while(true)
+	{
+		cin>>a;
+		for(int i=0;i<a.size();i++)
+		{
+			f=a[i];
+			if(f>='A'&&f<='Z') f=(f-'A'+3)%26+'A';
+			if(f>='a'&&f<='z') f=(f-'a'+3)%26+'a'; 
+		    cout<<f;
+		}
+		cout<<endl<<endl;
+	}
+}