diff --git a/Practice_03/p03-4.c b/Practice_03/p03-4.c
new file mode 100644
index 0000000..4657d78
--- /dev/null
+++ b/Practice_03/p03-4.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdint.h>
+
+void printBinary(unsigned char byte);
+
+int main(void){
+    int a = 10;
+    unsigned char *p = (unsigned char*)&a;
+
+    printf("int a = %d\n", a);
+    printf("메모리 저장 순서 : \n");
+
+    for(int i = 0; i < sizeof(a); i++){
+        printf("주소 %p : 0x%02X", (p + i), p[i]);
+        printBinary(p[i]);
+    }
+
+    return 0;
+}
+
+void printBinary(unsigned char byte){
+    printf(" --> ");
+    for(int i = 7; i >= 0; i--){
+        printf("%d", (byte >> i) & 1);
+    }
+
+    printf("\n");
+}
\ No newline at end of file