diff --git a/Practice_03/p03-1.c b/Practice_03/p03-1.c
new file mode 100644
index 0000000..480c92a
--- /dev/null
+++ b/Practice_03/p03-1.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main(){
+    printf("[%d]\n", 123);
+    printf("[%10d]\n", 123);
+    printf("[%010d]\n", 123);
+    printf("[%-10d]\n", 123);
+    printf("[%d]\n", -123);
+    printf("[% d]\n", 123);
+    printf("[%#xd]\n", 0x12);
+
+    printf("[%10s]\n", "ab");
+    printf("[%-10s]\n", "ab");
+
+    printf("[%f]\n", 1.23456789);
+    printf("[%.3f]\n", 1.23456789);
+    printf("[%10.3f]\n", 1.23456789);
+    printf("[%-10.3f]\n", 1.23456789);
+
+    return 0;
+}
\ No newline at end of file