diff --git a/practice/g_bitFlag.c b/practice/g_bitFlag.c
new file mode 100644
index 0000000..ee92479
--- /dev/null
+++ b/practice/g_bitFlag.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+#define FLAG_A 0x01 // 0000 0001
+#define FLAG_B 0x02 // 0000 0010
+#define FLAG_C 0x04 // 0000 0100
+
+int main()
+{
+    unsigned char flags = 0;
+
+    printf("A: %c, B: %c, C: %c\n", (flags & FLAG_A ? 'O' : 'X'), (flags & FLAG_B ? 'O' : 'X'), (flags & FLAG_C ? 'O' : 'X'));
+
+    // A 활성화
+    flags |= FLAG_A;
+    printf("A: %c, B: %c, C: %c\n", (flags & FLAG_A ? 'O' : 'X'), (flags & FLAG_B ? 'O' : 'X'), (flags & FLAG_C ? 'O' : 'X'));
+
+    // C 활성화
+    flags |= FLAG_C;
+    printf("A: %c, B: %c, C: %c\n", (flags & FLAG_A ? 'O' : 'X'), (flags & FLAG_B ? 'O' : 'X'), (flags & FLAG_C ? 'O' : 'X'));
+    
+    // B 활성화
+    flags |= FLAG_B;
+    printf("A: %c, B: %c, C: %c\n", (flags & FLAG_A ? 'O' : 'X'), (flags & FLAG_B ? 'O' : 'X'), (flags & FLAG_C ? 'O' : 'X'));
+
+    // B 비활성화
+    flags &= ~FLAG_B;
+    printf("A: %c, B: %c, C: %c\n", (flags & FLAG_A ? 'O' : 'X'), (flags & FLAG_B ? 'O' : 'X'), (flags & FLAG_C ? 'O' : 'X'));
+
+    return 0;
+}
\ No newline at end of file