diff --git a/ChangeLog b/ChangeLog
index c0943cf..84ade0c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2024-06-30  hwpplayer1  <hwpplayer1@debian>
 
+	* c-basic/C.pdf: sayfa 22 Fonksiyonların Geri Dönüş Değerleri (return value)
+
 	* c-basic/float_double.c: float double example
 
 	* c-basic/hex_scanf.c: hex scanf example
diff --git a/c-basic/ab_c.c b/c-basic/ab_c.c
new file mode 100644
index 0000000..1835319
--- /dev/null
+++ b/c-basic/ab_c.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main()
+{
+    double a, b, c;
+    printf("type your number a:");
+    scanf("%lf", &a);
+    printf("type your number b:");
+    scanf("%lf", &b);
+    c = a + b;
+    printf("c is %f\n", c);
+
+    return 0;
+}
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