From 39f7a17cc1e1b93d3ee0c85548131a96f7fb7c19 Mon Sep 17 00:00:00 2001
From: juan <juancloudcomputing@protonmail.com>
Date: Wed, 29 Sep 2021 19:14:47 +0800
Subject: [PATCH] add 4-xpr1.c

---
 pset2/4-xpr1.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 pset2/4-xpr1.c

diff --git a/pset2/4-xpr1.c b/pset2/4-xpr1.c
new file mode 100644
index 0000000..04c130f
--- /dev/null
+++ b/pset2/4-xpr1.c
@@ -0,0 +1,15 @@
+#include <math.h>
+#include <stdio.h>
+
+int main(void) {
+
+  // initialize variables
+  double a, b, c, d;
+  scanf("%lf %lf %lf %lf", &a, &b, &c, &d);
+
+  // trinary expression magic. same as above
+  (b * c - d < 1e-6 && b * c - d > -1e-6) ? printf("error")
+                                          : printf("%.1lf", a / (b * c - d));
+
+  return 0;
+}