diff --git a/Practice_03/app03-1.c b/Practice_03/app03-1.c
new file mode 100644
index 0000000..be08e0e
--- /dev/null
+++ b/Practice_03/app03-1.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main(){
+    int num1, num2;
+
+    printf("첫 번재 정수 : ");
+    scanf("%d", &num1);
+    printf("두 번재 정수 : ");
+    scanf("%d", &num2);
+
+    printf("%d + %d = %d\n", num1, num2, num1 + num2);
+    printf("%d - %d = %d\n", num1, num2, num1 - num2);
+    printf("%d * %d = %d\n", num1, num2, num1 * num2);
+    printf("%d / %d = %.2f\n", num1, num2, (float)num1 / num2);
+
+    return 0;
+}
\ No newline at end of file