diff --git a/10_plus/10.10.c b/10_plus/10.10.c
new file mode 100644
index 0000000..0e60b57
--- /dev/null
+++ b/10_plus/10.10.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include "10.9_10.h"
+int sum (int ar[], int n)
+{
+    int i;
+    int total = 0;
+
+    for (i = 0; i < n; i ++)
+    {
+        total += ar[i];
+    }
+    printf ("The size of ar is %zd bytes. \n", sizeof ar);
+
+    return total;
+}
+int sump (int * start, int * end)
+{
+    int total = 0;
+
+    while (start < end)
+    {
+        total += *start;
+        start ++;
+    }
+
+    return total;
+}
\ No newline at end of file
diff --git a/10_plus/10.11.c b/10_plus/10.11.c
new file mode 100644
index 0000000..4c79635
--- /dev/null
+++ b/10_plus/10.11.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+int data[2] = {100, 200};
+int moredata[2] = {300, 400};
+int main (void)
+{
+    int * p1, * p2, * p3;
+
+    p1 = p2 = data;
+    p3 = moredata;
+    printf ("   *p1 = %d,    *p2 = %d,      *p3 = %d\n", *p1, *p2, *p3);
+    printf ("*p1 ++ = %d, *++ p2 = %d, ++ (*p3) = %d\n", *p1 ++, *++ p2, ++ (*p3));
+    printf ("   *p1 = %d,    *p2 = %d,      *p3 = %d\n", *p1, *p2, *p3);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/10_plus/10.12.c b/10_plus/10.12.c
new file mode 100644
index 0000000..258b43a
--- /dev/null
+++ b/10_plus/10.12.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+int main (void)
+{
+    int urn [5] = {100, 200, 300, 400, 500};
+    int * ptr1, * ptr2, *ptr3;
+
+
+    ptr1 = urn;
+    ptr2 = &urn [2];
+    printf ("pointer value, dereferenced pointer, pointer address: \n");
+    printf ("ptr1 = %p, *ptr1 = %d, &ptr1 = %p\n", ptr1, *ptr1, &ptr1);
+    ptr3 = ptr1 + 4;
+    printf ("\nadding an int to a pointer: \n");
+    printf ("prt1 + 4 = %p, *(ptr1 + 4) = %d\n", ptr1 + 4, *(ptr1 + 4));
+    ptr1 ++;
+    printf ("\nvalues after ptr1 ++:\n");
+    printf ("ptr1 = %p, *ptr1 = %d, &ptr1 = %p\n",  ptr1, *ptr1, &ptr1);
+    ptr2 --;
+    printf ("\nvalues after -- ptr2:\n");
+    printf ("ptr2 = %p, *ptr2 = %d, &ptr2 = %p\n", ptr2, *ptr2, &ptr2);
+    -- ptr1;
+    ++ ptr2;
+    printf ("\nPointers reset to original values:\n");
+    printf ("ptr1 = %p, ptr2 = %p\n", ptr1, ptr2);
+    printf ("\nsubtracting one pointer from another: \n");
+    printf ("ptr2 = %p, ptr1 = %p ptr2 - ptr1 = %td\n", ptr2, ptr1, ptr2 - ptr1);
+    printf ("\nsubtracting an int from a pointer: \n");
+    printf ("ptr3 = %p, ptr3 - 2 = %p\n", ptr3, ptr3 - 2);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/10_plus/10.13.c b/10_plus/10.13.c
new file mode 100644
index 0000000..fd7b94f
--- /dev/null
+++ b/10_plus/10.13.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include "10.13_14.h"
+int main (void)
+{
+    double dip[SIZE] = {20.0, 17.66, 8.2, 15.3, 22.22};
+
+    printf ("The original dip array: \n");
+    show_array (dip, SIZE);
+    mult_array (dip, SIZE, 2.5);
+    printf ("The dip array after calling mult_array(): \n");
+    show_array (dip, SIZE);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/10_plus/10.13_14.h b/10_plus/10.13_14.h
new file mode 100644
index 0000000..92c0a9c
--- /dev/null
+++ b/10_plus/10.13_14.h
@@ -0,0 +1,3 @@
+#define SIZE 5
+void show_array (const double ar[], int n);
+void mult_array (double * ar, int n, double mult);
\ No newline at end of file
diff --git a/10_plus/10.14.c b/10_plus/10.14.c
new file mode 100644
index 0000000..a677bca
--- /dev/null
+++ b/10_plus/10.14.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include "10.13_14.h"
+void show_array (const double ar[], int n)
+{
+    int i;
+
+    for (i = 0; i < n; i ++)
+    {
+        printf ("%8.3f", ar[i]);
+    }
+    putchar ('\n');
+}
+void mult_array (double ar[], int n, double mult)
+{
+    int i;
+
+    for (i = 0; i < n; i ++)
+    {
+        ar[i] *= mult;
+    }
+}
\ No newline at end of file
diff --git a/10_plus/10.9.c b/10_plus/10.9.c
new file mode 100644
index 0000000..c18a7a1
--- /dev/null
+++ b/10_plus/10.9.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include "10.9_10.h"
+int main (void)
+{
+    int marbles[SIZE] = {20, 10, 5, 39, 4, 16, 19, 26, 31, 20};
+    long answer;
+
+    answer = sum (marbles, SIZE);
+    printf ("The total number of marbles is %ld. \n", answer);
+    printf ("The size of marbles is %zd bytes with %zd element. \n", sizeof marbles,
+            sizeof marbles / sizeof marbles[0]);
+    printf ("The total number of marbles is %d, in another method. \n", sump (marbles, marbles + SIZE));
+
+
+    return 0;
+}
\ No newline at end of file
diff --git a/10_plus/10.9_10.h b/10_plus/10.9_10.h
new file mode 100644
index 0000000..9147b0b
--- /dev/null
+++ b/10_plus/10.9_10.h
@@ -0,0 +1,3 @@
+#define SIZE 10
+int sum (int ar[], int n);
+int sump (int * start, int * end);
\ No newline at end of file
diff --git a/10_plus/CMakeLists.txt b/10_plus/CMakeLists.txt
index 4b4b6eb..1581f42 100644
--- a/10_plus/CMakeLists.txt
+++ b/10_plus/CMakeLists.txt
@@ -3,4 +3,4 @@ project(10_plus C)
 
 set(CMAKE_C_STANDARD 11)
 
-add_executable(10_plus 10.8.c )
+add_executable(10_plus 10.12.c)
diff --git a/10_plus/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-6f8b5d172b22e65cf7af.json b/10_plus/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-81e8f7e3803420ec4a42.json
similarity index 93%
rename from 10_plus/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-6f8b5d172b22e65cf7af.json
rename to 10_plus/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-81e8f7e3803420ec4a42.json
index 3dd94e3..b9de981 100644
--- a/10_plus/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-6f8b5d172b22e65cf7af.json
+++ b/10_plus/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-81e8f7e3803420ec4a42.json
@@ -39,7 +39,7 @@
 				{
 					"directoryIndex" : 0,
 					"id" : "10_plus::@6890427a1f51a3e7e1df",
-					"jsonFile" : "target-10_plus-Debug-ba98c6d6ec40d23a50bd.json",
+					"jsonFile" : "target-10_plus-Debug-fdd78151459e882e1421.json",
 					"name" : "10_plus",
 					"projectIndex" : 0
 				}
diff --git a/10_plus/cmake-build-debug/.cmake/api/v1/reply/index-2023-12-15T04-39-09-0133.json b/10_plus/cmake-build-debug/.cmake/api/v1/reply/index-2023-12-15T05-56-52-0669.json
similarity index 93%
rename from 10_plus/cmake-build-debug/.cmake/api/v1/reply/index-2023-12-15T04-39-09-0133.json
rename to 10_plus/cmake-build-debug/.cmake/api/v1/reply/index-2023-12-15T05-56-52-0669.json
index e1fa236..e04cbcd 100644
--- a/10_plus/cmake-build-debug/.cmake/api/v1/reply/index-2023-12-15T04-39-09-0133.json
+++ b/10_plus/cmake-build-debug/.cmake/api/v1/reply/index-2023-12-15T05-56-52-0669.json
@@ -26,7 +26,7 @@
 	"objects" : 
 	[
 		{
-			"jsonFile" : "codemodel-v2-6f8b5d172b22e65cf7af.json",
+			"jsonFile" : "codemodel-v2-81e8f7e3803420ec4a42.json",
 			"kind" : "codemodel",
 			"version" : 
 			{
@@ -86,7 +86,7 @@
 		},
 		"codemodel-v2" : 
 		{
-			"jsonFile" : "codemodel-v2-6f8b5d172b22e65cf7af.json",
+			"jsonFile" : "codemodel-v2-81e8f7e3803420ec4a42.json",
 			"kind" : "codemodel",
 			"version" : 
 			{
diff --git a/10_plus/cmake-build-debug/.cmake/api/v1/reply/target-10_plus-Debug-ba98c6d6ec40d23a50bd.json b/10_plus/cmake-build-debug/.cmake/api/v1/reply/target-10_plus-Debug-fdd78151459e882e1421.json
similarity index 98%
rename from 10_plus/cmake-build-debug/.cmake/api/v1/reply/target-10_plus-Debug-ba98c6d6ec40d23a50bd.json
rename to 10_plus/cmake-build-debug/.cmake/api/v1/reply/target-10_plus-Debug-fdd78151459e882e1421.json
index 734ba8c..73775ac 100644
--- a/10_plus/cmake-build-debug/.cmake/api/v1/reply/target-10_plus-Debug-ba98c6d6ec40d23a50bd.json
+++ b/10_plus/cmake-build-debug/.cmake/api/v1/reply/target-10_plus-Debug-fdd78151459e882e1421.json
@@ -91,7 +91,7 @@
 		{
 			"backtrace" : 1,
 			"compileGroupIndex" : 0,
-			"path" : "10.8.c",
+			"path" : "10.12.c",
 			"sourceGroupIndex" : 0
 		}
 	],
diff --git a/10_plus/cmake-build-debug/.ninja_deps b/10_plus/cmake-build-debug/.ninja_deps
index 224ea6b..00e94a5 100644
Binary files a/10_plus/cmake-build-debug/.ninja_deps and b/10_plus/cmake-build-debug/.ninja_deps differ
diff --git a/10_plus/cmake-build-debug/.ninja_log b/10_plus/cmake-build-debug/.ninja_log
index ffc94a2..f04614a 100644
--- a/10_plus/cmake-build-debug/.ninja_log
+++ b/10_plus/cmake-build-debug/.ninja_log
@@ -1,6 +1,10 @@
 # ninja log v5
 1	109	1702553285008837028	CMakeFiles/10_plus.dir/10.6.c.o	5a331c68b6c38d00
-622	837	1702614375084499001	10_plus	61bafc99badd150b
+1	94	1702617702147214875	CMakeFiles/10_plus.dir/10.10.c.o	440426100649bdfa
+1	106	1702618741316400631	CMakeFiles/10_plus.dir/10.11.c.o	8e75bce6881361f1
 1	622	1702614374868595042	CMakeFiles/10_plus.dir/10.7.c.o	1e18d949d1aef50d
+107	284	1702618741489331650	10_plus	80808cea9c55f17c
+0	93	1702617702146103915	CMakeFiles/10_plus.dir/10.9.c.o	7e601dff9ca5f896
 1	228	1702615135836040224	CMakeFiles/10_plus.dir/10.8.c.o	7e3301fb757e0e25
-3	207	1702615152861270317	10_plus	a059e66eb2ad5f05
+0	199	1702620425452530568	CMakeFiles/10_plus.dir/10.12.c.o	882194e809a577c7
+200	415	1702620425668211985	10_plus	a1fb0accaa872bfa
diff --git a/10_plus/cmake-build-debug/10_plus b/10_plus/cmake-build-debug/10_plus
index 2255d0a..019664f 100755
Binary files a/10_plus/cmake-build-debug/10_plus and b/10_plus/cmake-build-debug/10_plus differ
diff --git a/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.10.c.o b/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.10.c.o
new file mode 100644
index 0000000..5d378c2
Binary files /dev/null and b/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.10.c.o differ
diff --git a/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.11.c.o b/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.11.c.o
new file mode 100644
index 0000000..2ae9e10
Binary files /dev/null and b/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.11.c.o differ
diff --git a/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.12.c.o b/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.12.c.o
new file mode 100644
index 0000000..166900f
Binary files /dev/null and b/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.12.c.o differ
diff --git a/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.9.c.o b/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.9.c.o
new file mode 100644
index 0000000..2c56237
Binary files /dev/null and b/10_plus/cmake-build-debug/CMakeFiles/10_plus.dir/10.9.c.o differ
diff --git a/10_plus/cmake-build-debug/CMakeFiles/clion-Debug-log.txt b/10_plus/cmake-build-debug/CMakeFiles/clion-Debug-log.txt
index c175b1a..743c967 100644
--- a/10_plus/cmake-build-debug/CMakeFiles/clion-Debug-log.txt
+++ b/10_plus/cmake-build-debug/CMakeFiles/clion-Debug-log.txt
@@ -1,4 +1,4 @@
 /Applications/CLion.app/Contents/bin/cmake/mac/x64/bin/cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_MAKE_PROGRAM=/Applications/CLion.app/Contents/bin/ninja/mac/x64/ninja -G Ninja -S /Users/tgspock/Documents/GitHub/learn_c_primer.github.io/10_plus -B /Users/tgspock/Documents/GitHub/learn_c_primer.github.io/10_plus/cmake-build-debug
--- Configuring done (0.0s)
+-- Configuring done (0.1s)
 -- Generating done (0.0s)
 -- Build files have been written to: /Users/tgspock/Documents/GitHub/learn_c_primer.github.io/10_plus/cmake-build-debug
diff --git a/10_plus/cmake-build-debug/Testing/Temporary/LastTest.log b/10_plus/cmake-build-debug/Testing/Temporary/LastTest.log
index 0eef070..7689db6 100644
--- a/10_plus/cmake-build-debug/Testing/Temporary/LastTest.log
+++ b/10_plus/cmake-build-debug/Testing/Temporary/LastTest.log
@@ -1,3 +1,3 @@
-Start testing: Dec 15 12:39 CST
+Start testing: Dec 15 14:07 CST
 ----------------------------------------------------------
-End testing: Dec 15 12:39 CST
+End testing: Dec 15 14:07 CST
diff --git a/10_plus/cmake-build-debug/build.ninja b/10_plus/cmake-build-debug/build.ninja
index 5e5adc0..f742912 100644
--- a/10_plus/cmake-build-debug/build.ninja
+++ b/10_plus/cmake-build-debug/build.ninja
@@ -49,8 +49,8 @@ cmake_ninja_workdir = /Users/tgspock/Documents/GitHub/learn_c_primer.github.io/1
 
 build cmake_object_order_depends_target_10_plus: phony || CMakeFiles/10_plus.dir
 
-build CMakeFiles/10_plus.dir/10.8.c.o: C_COMPILER__10_plus_unscanned_Debug /Users/tgspock/Documents/GitHub/learn_c_primer.github.io/10_plus/10.8.c || cmake_object_order_depends_target_10_plus
-  DEP_FILE = CMakeFiles/10_plus.dir/10.8.c.o.d
+build CMakeFiles/10_plus.dir/10.12.c.o: C_COMPILER__10_plus_unscanned_Debug /Users/tgspock/Documents/GitHub/learn_c_primer.github.io/10_plus/10.12.c || cmake_object_order_depends_target_10_plus
+  DEP_FILE = CMakeFiles/10_plus.dir/10.12.c.o.d
   FLAGS = -g -std=gnu11 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.1.sdk -mmacosx-version-min=12.7 -fcolor-diagnostics
   OBJECT_DIR = CMakeFiles/10_plus.dir
   OBJECT_FILE_DIR = CMakeFiles/10_plus.dir
@@ -63,7 +63,7 @@ build CMakeFiles/10_plus.dir/10.8.c.o: C_COMPILER__10_plus_unscanned_Debug /User
 #############################################
 # Link the executable 10_plus
 
-build 10_plus: C_EXECUTABLE_LINKER__10_plus_Debug CMakeFiles/10_plus.dir/10.8.c.o
+build 10_plus: C_EXECUTABLE_LINKER__10_plus_Debug CMakeFiles/10_plus.dir/10.12.c.o
   FLAGS = -g -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.1.sdk -mmacosx-version-min=12.7
   OBJECT_DIR = CMakeFiles/10_plus.dir
   POST_BUILD = :
diff --git a/9_plus/9_plus/9.30.c b/9_plus/9_plus/9.30.c
index 2bbdda8..a7fd582 100644
--- a/9_plus/9_plus/9.30.c
+++ b/9_plus/9_plus/9.30.c
@@ -21,7 +21,7 @@ int main (void)
             printf ("Now the third one: \n");
             if (scanf ("%lf", &q[M - 1]) == 1)
             {
-                pair (q, M);
+                pair (&q[0], M);
                 printf ("%lf > %lf > %lf. \n", q[0], q[1], q[2]);
                 printf ("Please enter another three numbers (still q to quit): \n");
                 printf ("Now the first one: \n");
diff --git a/9_plus/9_plus/cmake-build-debug/.ninja_deps b/9_plus/9_plus/cmake-build-debug/.ninja_deps
index 9923084..eba4beb 100644
Binary files a/9_plus/9_plus/cmake-build-debug/.ninja_deps and b/9_plus/9_plus/cmake-build-debug/.ninja_deps differ
diff --git a/9_plus/9_plus/cmake-build-debug/.ninja_log b/9_plus/9_plus/cmake-build-debug/.ninja_log
index 315be1f..a6a7850 100644
--- a/9_plus/9_plus/cmake-build-debug/.ninja_log
+++ b/9_plus/9_plus/cmake-build-debug/.ninja_log
@@ -6,3 +6,5 @@
 1	345	1702564121797087815	build.ninja	89680b399b5eaefe
 5	153	1702564160395573201	CMakeFiles/9_plus.dir/9.31.c.o	33ea98186e0c8a08
 153	390	1702564160634652318	9_plus	4f8961afe2f42660
+1	575	1702615854461385433	CMakeFiles/9_plus.dir/9.30.c.o	28e2f64a1addd6aa
+575	699	1702615854586251093	9_plus	4f8961afe2f42660
diff --git a/9_plus/9_plus/cmake-build-debug/9_plus b/9_plus/9_plus/cmake-build-debug/9_plus
index 589d936..f699312 100755
Binary files a/9_plus/9_plus/cmake-build-debug/9_plus and b/9_plus/9_plus/cmake-build-debug/9_plus differ
diff --git a/9_plus/9_plus/cmake-build-debug/CMakeFiles/9_plus.dir/9.30.c.o b/9_plus/9_plus/cmake-build-debug/CMakeFiles/9_plus.dir/9.30.c.o
index 3c7b162..36e0ca3 100644
Binary files a/9_plus/9_plus/cmake-build-debug/CMakeFiles/9_plus.dir/9.30.c.o and b/9_plus/9_plus/cmake-build-debug/CMakeFiles/9_plus.dir/9.30.c.o differ
diff --git a/9_plus/9_plus/cmake-build-debug/Testing/Temporary/LastTest.log b/9_plus/9_plus/cmake-build-debug/Testing/Temporary/LastTest.log
index 78432d6..e768239 100644
--- a/9_plus/9_plus/cmake-build-debug/Testing/Temporary/LastTest.log
+++ b/9_plus/9_plus/cmake-build-debug/Testing/Temporary/LastTest.log
@@ -1,3 +1,3 @@
-Start testing: Dec 14 22:29 CST
+Start testing: Dec 15 12:50 CST
 ----------------------------------------------------------
-End testing: Dec 14 22:29 CST
+End testing: Dec 15 12:50 CST
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 88a0397..0e1b4af 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,4 +6,5 @@ set(CMAKE_CXX_STANDARD 14)
 include_directories(9)
 
 add_executable(C_primer
-        10_plus/10.7.c 10_plus/10.8.c 10_plus/10.7_8.h)
+        10_plus/10.13.c 10_plus/10.14.c 10_plus/10.13_14.h
+)
diff --git a/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-502bade4589e59d1ca29.json b/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-06f5439d6793c55423fd.json
similarity index 93%
rename from cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-502bade4589e59d1ca29.json
rename to cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-06f5439d6793c55423fd.json
index 7113946..b497804 100644
--- a/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-502bade4589e59d1ca29.json
+++ b/cmake-build-debug/.cmake/api/v1/reply/codemodel-v2-06f5439d6793c55423fd.json
@@ -39,7 +39,7 @@
 				{
 					"directoryIndex" : 0,
 					"id" : "C_primer::@6890427a1f51a3e7e1df",
-					"jsonFile" : "target-C_primer-Debug-90e17ebc17efde61c9dd.json",
+					"jsonFile" : "target-C_primer-Debug-fe2f8957925620870bf8.json",
 					"name" : "C_primer",
 					"projectIndex" : 0
 				}
diff --git a/cmake-build-debug/.cmake/api/v1/reply/index-2023-12-14T14-50-37-0309.json b/cmake-build-debug/.cmake/api/v1/reply/index-2023-12-17T14-34-19-0817.json
similarity index 93%
rename from cmake-build-debug/.cmake/api/v1/reply/index-2023-12-14T14-50-37-0309.json
rename to cmake-build-debug/.cmake/api/v1/reply/index-2023-12-17T14-34-19-0817.json
index 6099529..68d331c 100644
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index 1d1d5d2..fc7b854 100644
--- a/cmake-build-debug/Testing/Temporary/LastTest.log
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@@ -1,3 +1,3 @@
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+Start testing: Dec 17 23:03 CST
 ----------------------------------------------------------
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diff --git a/cmake-build-debug/build.ninja b/cmake-build-debug/build.ninja
index 6e016ef..6f93fa1 100644
--- a/cmake-build-debug/build.ninja
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