diff --git a/ChangeLog b/ChangeLog
index af28088..06e2400 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2025-03-07  Mert Gör  <mertgor@masscollabs.xyz>
+
+	* c-basic/CSD-C-Basic-Book/C.pdf: Fonksiyonların Geri Dönüş Değerleri (return value) sayfa 22 
+
 2025-02-04  Mert Gör  <mertgor@masscollabs.xyz>
 
 	* c-basic/CSD-C-Basic-Book/C.pdf: 30. page sqrt example solved
diff --git a/c-basic/double_example_01.c b/c-basic/double_example_01.c
new file mode 100644
index 0000000..1fea556
--- /dev/null
+++ b/c-basic/double_example_01.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main()
+{
+  double a,b,c;
+  printf("enter double number a:\n");
+  scanf("%lf", &a);
+  printf("enter double number b:\n");
+  scanf("%lf", &b);
+
+  c = a + b;
+
+  printf("%f", c);
+
+  return 0;
+}
diff --git a/c-basic/scanf_example_01.c b/c-basic/scanf_example_01.c
new file mode 100644
index 0000000..6d7e75b
--- /dev/null
+++ b/c-basic/scanf_example_01.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main()
+{
+  int a;
+  int b;
+
+  printf("Enter two numbers:\n");
+  scanf("%d%d", &a, &b);
+  printf("a = %d, b = %d\n", a, b);
+
+  return 0;
+}
diff --git a/c-basic/scanf_example_02.c b/c-basic/scanf_example_02.c
new file mode 100644
index 0000000..c4cb062
--- /dev/null
+++ b/c-basic/scanf_example_02.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main()
+{
+  int a;
+  int b;
+
+  printf("Enter number a:\n");
+  scanf("%d", &a);
+  printf("Enter number b:\n");
+  scanf("%d", &b);
+  printf("a = %d, b = %d\n", a, b);
+
+  return 0;
+}