From 1d200f9534a523d9cf11c14a4cc2ada750f457a2 Mon Sep 17 00:00:00 2001
From: juan <juancloudcomputing@protonmail.com>
Date: Wed, 29 Sep 2021 22:20:05 +0800
Subject: [PATCH] add 5 and 6

---
 pset2/5-shopping.c | 23 +++++++++++++++++++++++
 pset2/6-triangle.c | 18 ++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 pset2/5-shopping.c
 create mode 100644 pset2/6-triangle.c

diff --git a/pset2/5-shopping.c b/pset2/5-shopping.c
new file mode 100644
index 0000000..1eeccac
--- /dev/null
+++ b/pset2/5-shopping.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+int main(void) {
+  // add up money
+  int total = 0, single;
+  for (int i = 0; i < 4; i++) {
+    scanf("%i", &single);
+    total += single;
+  }
+
+  // evaluate results
+  if (total >= 40) {
+    printf("%i", total);
+  } else if (total >= 30) {
+    printf("%i", total + 5);
+  } else if (total >= 20) {
+    printf("%i", total + 8);
+  } else {
+    printf("%i", total + 10);
+  }
+
+  return 0;
+}
diff --git a/pset2/6-triangle.c b/pset2/6-triangle.c
new file mode 100644
index 0000000..58476ad
--- /dev/null
+++ b/pset2/6-triangle.c
@@ -0,0 +1,18 @@
+#include <math.h>
+#include <stdio.h>
+
+int main(void) {
+  // Initialize values
+  int a, b, c;
+  scanf("%i %i %i", &a, &b, &c);
+
+  // Calculate S and area's 2 power
+  double s = (a + b + c) / (double)2;
+  double area = (s * (s - a) * (s - b) * (s - c));
+
+  // Print answer
+  (area > 0) ? printf("%.3lf", sqrt(area))
+             : printf("The edges cannot make up of a triangle.");
+
+  return 0;
+}