diff --git a/666/交换.cpp b/666/交换.cpp
new file mode 100644
index 0000000..e2ade56
--- /dev/null
+++ b/666/交换.cpp
@@ -0,0 +1,13 @@
+#include<iostream>
+using namespace std;
+int main(){
+
+   int a,b,c; 
+    cin>>a>>b;
+    cout<<a<<"  "<<b<<"  ";
+    c=a;
+    a=b;
+    b=c;
+    cout<<a<<"  "<<b<<endl;
+    return 0;
+}
diff --git a/666/交换2.cpp b/666/交换2.cpp
new file mode 100644
index 0000000..e2ade56
--- /dev/null
+++ b/666/交换2.cpp
@@ -0,0 +1,13 @@
+#include<iostream>
+using namespace std;
+int main(){
+
+   int a,b,c; 
+    cin>>a>>b;
+    cout<<a<<"  "<<b<<"  ";
+    c=a;
+    a=b;
+    b=c;
+    cout<<a<<"  "<<b<<endl;
+    return 0;
+}
diff --git a/666/交换3.cpp b/666/交换3.cpp
new file mode 100644
index 0000000..c151e2d
--- /dev/null
+++ b/666/交换3.cpp
@@ -0,0 +1,18 @@
+#include<iostream>
+using namespace std;
+int main(){
+
+   int a=25,b=32,tmp; 
+   int *ptr_a, *ptr_b;
+
+    ptr_a=&a;
+    ptr_b=&b;
+    
+    cout<<*ptr_a<<"  "<<*ptr_b<<"  ";
+    cout<<ptr_a<<"  "<<ptr_b<<"  ";
+        tmp=*ptr_a;
+       *ptr_a=*ptr_b;
+        *ptr_b=tmp;
+        cout<<a<<"  "<<b<<endl;
+    return 0;
+}
diff --git a/666/最大值2.cpp b/666/最大值2.cpp
new file mode 100644
index 0000000..1eab9d9
--- /dev/null
+++ b/666/最大值2.cpp
@@ -0,0 +1,24 @@
+#include<iostream>
+using namespace std;
+int main(){
+    int a[5]={87,99,3,12,1};
+    int max=a[0];
+    int * ptr_x;
+    ptr_x=a;
+
+
+    for(int i=1;i<5;i++){
+    
+        if(*ptr_x > max){
+             max = *ptr_x;
+        }
+         ptr_x++;
+        cout<<ptr_x<<endl;
+
+     }
+
+    cout<<max<<"    ";
+
+    return 0;
+}
+
diff --git a/666/最大值3.cpp b/666/最大值3.cpp
new file mode 100644
index 0000000..8ebff55
--- /dev/null
+++ b/666/最大值3.cpp
@@ -0,0 +1,17 @@
+#include<iostream>
+using namespace std;
+int main(){
+    int a[5]={9,99,999,9999,99999};
+    int *ptr_x;
+    int max;
+    ptr_x=a;
+        max=*ptr_x;
+        for(int i=1;i<=5;i++){
+        if(*ptr_x>max)
+            max=*ptr_x;
+            ptr_x++;                                                                
+}
+    cout<<max<<endl;
+    return 0;
+}
+