diff --git a/Week04/arrays_sinem_isk.py b/Week04/arrays_sinem_isk.py
new file mode 100644
index 0000000..6b928c1
--- /dev/null
+++ b/Week04/arrays_sinem_isk.py
@@ -0,0 +1,20 @@
+import numpy as np
+
+def replace_center_with_minus_one(d, n, m):
+    if m > n:
+        raise ValueError("m cannot be greater than n")
+    if d <= 0 or n <= 0 or m < 0:
+        raise ValueError("d, n must be positive and m cannot be negative")
+
+    max_val = 10**d - 1  # d basamaklı maksimum sayı (örnek: d=2 -> 99)
+    arr = np.random.randint(0, max_val + 1, size=(n, n))
+
+    start = (n - m) // 2
+    end = start + m
+    arr[start:end, start:end] = -1
+
+    return arr
+
+if __name__ == "__main__":
+    result = replace_center_with_minus_one(2, 5, 3)
+    print(result)