diff --git a/.kdev4/study_cpp.kdev4 b/.kdev4/study_cpp.kdev4
new file mode 100644
index 0000000..58de3f2
--- /dev/null
+++ b/.kdev4/study_cpp.kdev4
@@ -0,0 +1,19 @@
+[Buildset]
+BuildItems=@Variant(\x00\x00\x00\t\x00\x00\x00\x00\x01\x00\x00\x00\x0b\x00\x00\x00\x00\x01\x00\x00\x00\x12\x00s\x00t\x00u\x00d\x00y\x00_\x00c\x00p\x00p)
+
+[CMake]
+Build Directory Count=1
+Current Build Directory Index-主机系统=0
+
+[CMake][CMake Build Directory 0]
+Build Directory Path=/home/hmtsai/projects/study_cpp/build
+Build Type=Debug
+CMake Binary=/usr/bin/cmake
+CMake Executable=/usr/bin/cmake
+Environment Profile=
+Extra Arguments=
+Install Directory=
+Runtime=主机系统
+
+[Project]
+VersionControlSupport=kdevgit
diff --git a/src/type/class/tdate.cpp b/src/type/class/tdate.cpp
index 2ab7ec0..1fb9500 100644
--- a/src/type/class/tdate.cpp
+++ b/src/type/class/tdate.cpp
@@ -80,7 +80,9 @@ private:
 
 int main()
 {
-    Tdate date ( 21,10,2011 );
+    Tdate date ( 31,12,2011 );
+    date.printYear();
+    date.nextDay();
     date.printYear();
     cout<<date.isLeapYear() <<endl;
     return 0;
diff --git a/src/type/ptr/Advanced/ptr_array.cpp b/src/type/ptr/Advanced/ptr_array.cpp
new file mode 100644
index 0000000..7a0e257
--- /dev/null
+++ b/src/type/ptr/Advanced/ptr_array.cpp
@@ -0,0 +1,15 @@
+#include <iostream>
+using namespace std;
+int main(){
+    int a[5],i,*pa=a;
+    for(i=0;i<5;i++){
+        scanf("%d",pa);
+        pa++;
+    }
+    pa=a;
+    for(i=0;i<5;i++){
+        printf("a[%d]=%d\n",i,*pa);
+        pa++;
+    }
+    return 0;
+}
diff --git a/src/type/ptr/Advanced/ptr_cstring.cpp b/src/type/ptr/Advanced/ptr_cstring.cpp
new file mode 100644
index 0000000..b74dff1
--- /dev/null
+++ b/src/type/ptr/Advanced/ptr_cstring.cpp
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <iostream>
+#include <cstring>
+using namespace std;
+void swapchar(char &a,char&b){
+    char temp=a;
+    b=a;
+    a=temp;
+}
+
+int reverse(char *string_in){
+    int string_len=strlen(string_in);
+    char string_out[string_len];
+    for(int i=0;i<string_len/2;++i){
+        swapchar(string_in[i],string_in[string_len-i-1]);
+    }
+    return 0;
+}
+
+int main(){
+    char string[101];
+    char *in=string;
+    gets(in);
+    reverse(in);
+    cout<<in;
+    return 0;
+}
diff --git a/src/type/ptr/Advanced/ptr_darray.cpp b/src/type/ptr/Advanced/ptr_darray.cpp
new file mode 100644
index 0000000..126d409
--- /dev/null
+++ b/src/type/ptr/Advanced/ptr_darray.cpp
@@ -0,0 +1,18 @@
+#include <iostream>
+using namespace std;
+int main(){
+    int num,*ptr;
+    cin>>num;
+    ptr = new int[num];
+    for(int i=0;i<num;i++){
+        cin>>ptr[i];
+    }
+    for(int i=1;i<num;i++){
+        ptr[i]+=ptr[i-1];
+    }
+    for(int i=0;i<num;i++){
+        cout<<ptr[i]<<" ";
+    }
+    delete []ptr;
+    return 0;
+}
diff --git a/src/type/ptr/Advanced/ptr_param.cpp b/src/type/ptr/Advanced/ptr_param.cpp
new file mode 100644
index 0000000..99db5ba
--- /dev/null
+++ b/src/type/ptr/Advanced/ptr_param.cpp
@@ -0,0 +1,39 @@
+#include <iostream>
+#include <algorithm>
+using namespace std;
+void swap ( int *a,int *b )
+{
+        int temp=*a;
+        *a=*b;
+        *b=temp;
+}
+int sortInt ( int *a,int *b,int *c )
+{
+        /*
+            int list[4]={ *a,*b,*c };
+            sort ( list+0,list+3 );
+            *a=list[0];
+            *b=list[1];
+            *c=list[2];
+            //这是一个神奇的方法
+        */
+        if ( a>b ) {
+                swap ( a,b );
+        }
+        if ( a>c ) {
+                swap ( a,c );
+        }
+        if ( b>c ) {
+                swap ( b,c );
+        }
+        //这是一个正常的方法
+        return 0;
+}
+int main()
+{
+        int a,b,c,*ptr_a=&a,*ptr_b=&b,*ptr_c=&c;
+        cin>>a>>b>>c;
+        sortInt ( ptr_a,ptr_b,ptr_c );
+        cout<<a<<" "<<b<<" "<<c<<endl;
+        return 0;
+}
diff --git a/src/type/ptr/Basic/array.cpp b/src/type/ptr/Basic/array.cpp
new file mode 100644
index 0000000..5e67a74
--- /dev/null
+++ b/src/type/ptr/Basic/array.cpp
@@ -0,0 +1,20 @@
+#include <cstdio>
+#include <iostream>
+using namespace std;
+int main()
+{
+        int num;
+        scanf ( "%d",&num );
+        int array[num+1];
+        int *ptr=array+1;
+        for ( int i=1; i<=num; i++ ) {
+                cin>>*ptr;
+                ptr++;
+        }
+        ptr=array+1;
+        for ( int i=1; i<=num; i++ ) {
+                printf ( "%d ",*ptr );
+                ptr++;
+        }
+        return 0;
+}
diff --git a/src/type/ptr/Basic/doubleptr.cpp b/src/type/ptr/Basic/doubleptr.cpp
new file mode 100644
index 0000000..aff0cc5
--- /dev/null
+++ b/src/type/ptr/Basic/doubleptr.cpp
@@ -0,0 +1,9 @@
+#include <iostream>
+using namespace std;
+int a=10,*p=&a,**pp=&p;
+int main(){
+    cout<<"a="<<a<<endl;
+    cout<<"*p="<<*p<<endl;
+    cout<<"**pp="<<**pp<<endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/src/type/ptr/Basic/plus.cpp b/src/type/ptr/Basic/plus.cpp
new file mode 100644
index 0000000..7c7f131
--- /dev/null
+++ b/src/type/ptr/Basic/plus.cpp
@@ -0,0 +1,13 @@
+#include <iostream>
+using namespace std;
+int main()
+{
+    int a,b,sum,total;
+    cin>>a>>b;
+    int *pointer_a=&a,*pointer_b=&b;
+    sum= ( *pointer_a )+ ( *pointer_b );
+    total= ( *pointer_a ) * ( *pointer_b );
+    cout<<sum<<endl;
+    cout<<total<<endl;
+    return 0;
+}