diff --git a/practice/g_bitFlagForStruct.c b/practice/g_bitFlagForStruct.c
new file mode 100644
index 0000000..f272057
--- /dev/null
+++ b/practice/g_bitFlagForStruct.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+typedef struct
+{
+    unsigned int data : 10; // 10비트, 0~1023
+    unsigned int error_code : 6; // 6비트 플래그
+} DataPacket;
+
+int main()
+{
+    DataPacket packet;
+    packet.data = 108;
+    packet.error_code = 0;
+
+    printf("[Packet] data: %d, error_code: 0x%x\n", packet.data, packet.error_code);
+
+    // 에러 감지
+    // 0번째 비트 켜기
+    packet.error_code |= 1;
+    printf("[Packet] data: %d, error_code: 0x%x\n", packet.data, packet.error_code);
+    
+    // 3번째 비트 켜기
+    packet.error_code |= (1 << 3);
+    printf("[Packet] data: %d, error_code: 0x%x\n", packet.data, packet.error_code);
+
+    // 5번째 비트 켜기
+    packet.error_code |= (1 << 5);
+    printf("[Packet] data: %d, error_code: 0x%x\n", packet.data, packet.error_code);
+
+    return 0;
+}