diff --git a/0x18-dynamic_libraries/.100-operations.so.swp b/0x18-dynamic_libraries/.100-operations.so.swp
new file mode 100644
index 0000000..d0ab5b4
Binary files /dev/null and b/0x18-dynamic_libraries/.100-operations.so.swp differ
diff --git a/0x18-dynamic_libraries/1-create_dynamic_lib.sh b/0x18-dynamic_libraries/1-create_dynamic_lib.sh
new file mode 100755
index 0000000..ac3eaff
--- /dev/null
+++ b/0x18-dynamic_libraries/1-create_dynamic_lib.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+gcc -fPIC -c *.c
+gcc -shared *.o -o liball.so
+
diff --git a/0x18-dynamic_libraries/100-operations.c b/0x18-dynamic_libraries/100-operations.c
new file mode 100644
index 0000000..52584aa
--- /dev/null
+++ b/0x18-dynamic_libraries/100-operations.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+int add(int a, int b) {
+    return a + b;
+}
+
+int sub(int a, int b) {
+    return a - b;
+}
+
+int mul(int a, int b) {
+    return a * b;
+}
+
+int div(int a, int b) {
+    if (b == 0) {
+        printf("Error: Division by zero\n");
+        return 0;
+    }
+    return a / b;
+}
+
+int mod(int a, int b) {
+    if (b == 0) {
+        printf("Error: Division by zero\n");
+        return 0;
+    }
+    return a % b;
+}
+
diff --git a/0x18-dynamic_libraries/100-operations.o b/0x18-dynamic_libraries/100-operations.o
new file mode 100644
index 0000000..0eb8388
Binary files /dev/null and b/0x18-dynamic_libraries/100-operations.o differ
diff --git a/0x18-dynamic_libraries/100-operations.so b/0x18-dynamic_libraries/100-operations.so
new file mode 100755
index 0000000..df38e7b
Binary files /dev/null and b/0x18-dynamic_libraries/100-operations.so differ
diff --git a/0x18-dynamic_libraries/101-make_me_win.sh b/0x18-dynamic_libraries/101-make_me_win.sh
new file mode 100755
index 0000000..b5cc447
--- /dev/null
+++ b/0x18-dynamic_libraries/101-make_me_win.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+wget -P /tmp https://github.com/mahmoudkhalef/alx-low_level_programming/raw/master/0x18-dynamic_libraries/libgiga.so
+export LD_PRELOAD=/tmp/libgiga.so
+
diff --git a/0x18-dynamic_libraries/README.md b/0x18-dynamic_libraries/README.md
new file mode 100644
index 0000000..2847721
--- /dev/null
+++ b/0x18-dynamic_libraries/README.md
@@ -0,0 +1 @@
+dynamiclib
diff --git a/0x18-dynamic_libraries/libdynamic.so b/0x18-dynamic_libraries/libdynamic.so
new file mode 100755
index 0000000..9ec86e4
Binary files /dev/null and b/0x18-dynamic_libraries/libdynamic.so differ
diff --git a/0x18-dynamic_libraries/libgiga.so b/0x18-dynamic_libraries/libgiga.so
new file mode 100755
index 0000000..b7ad6f4
Binary files /dev/null and b/0x18-dynamic_libraries/libgiga.so differ
diff --git a/0x18-dynamic_libraries/main.h b/0x18-dynamic_libraries/main.h
new file mode 100644
index 0000000..aadc296
--- /dev/null
+++ b/0x18-dynamic_libraries/main.h
@@ -0,0 +1,29 @@
+#ifndef MAIN_H
+#define MAIN_H
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int _putchar(char c);
+int _islower(int c);
+int _isalpha(int c);
+int _abs(int n);
+int _isupper(int c);
+int _isdigit(int c);
+int _strlen(char *s);
+void _puts(char *s);
+char *_strcpy(char *dest, char *src);
+int _atoi(char *s);
+char *_strcat(char *dest, char *src);
+char *_strncat(char *dest, char *src, int n);
+char *_strncpy(char *dest, char *src, int n);
+int _strcmp(char *s1, char *s2);
+char *_memset(char *s, char b, unsigned int n);
+char *_memcpy(char *dest, char *src, unsigned int n);
+char *_strchr(char *s, char c);
+unsigned int _strspn(char *s, char *accept);
+char *_strpbrk(char *s, char *accept);
+char *_strstr(char *haystack, char *needle);
+
+#endif /* MAIN_H */
+