diff --git a/4.菱形输出.cpp b/4.菱形输出.cpp
new file mode 100644
index 0000000..8024b2c
--- /dev/null
+++ b/4.菱形输出.cpp
@@ -0,0 +1,24 @@
+#include <stdio.h>
+int main() {
+    // ���ǰ4��
+    for (int i = 0; i < 4; i++) {
+        for (int j = 0; j <= 2-i; j++) {
+            printf(" ");
+        }
+        for (int k = 0; k <= 2*i; k++) {
+            printf("*");
+        }
+        printf("\n");
+    }
+    // �����3��
+    for (int i = 0; i < 3; i++) {
+        for (int j = 0; j <= i; j++) {
+            printf(" ");
+        }
+        for (int k = 0; k <= 4-2*i; k++) {
+            printf("*");
+        }
+        printf("\n");
+    }
+  
+}