From c3608c3f898f106af9486c40c2715852ae5ab31c Mon Sep 17 00:00:00 2001
From: unlockable <g@unlockableworld.com>
Date: Fri, 7 Oct 2022 12:29:08 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E5=9B=9B=E8=AF=BE=E3=80=82?=
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---
 04/Exercise01.c | 11 +++++++++++
 04/Exercise02.c |  6 ++++++
 04/Exercise03.c | 13 +++++++++++++
 04/Optional.c   | 17 +++++++++++++++++
 4 files changed, 47 insertions(+)
 create mode 100644 04/Exercise01.c
 create mode 100644 04/Exercise02.c
 create mode 100644 04/Exercise03.c
 create mode 100644 04/Optional.c

diff --git a/04/Exercise01.c b/04/Exercise01.c
new file mode 100644
index 0000000..0c65076
--- /dev/null
+++ b/04/Exercise01.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <math.h>
+
+int main() {
+    double dx, dy, df_1, df_2;
+    scanf("%lf %lf", &dx, &dy);
+    df_1 = (1 / sqrt(2 * 3.14)) * exp(-(dx * dx) / 2);
+    df_2 = sin(dx*dx + dy*dy) * cos(dx + dy) / 3;
+    printf("f_1 = %lf, f_2 = %lf", df_1, df_2);
+    return 0;
+}
\ No newline at end of file
diff --git a/04/Exercise02.c b/04/Exercise02.c
new file mode 100644
index 0000000..a6d7c2e
--- /dev/null
+++ b/04/Exercise02.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+int main() {
+    int result, x;
+    printf("%d", (5 > 3 && 2 || 8 < 4 - !0));
+    return 0;
+}
\ No newline at end of file
diff --git a/04/Exercise03.c b/04/Exercise03.c
new file mode 100644
index 0000000..b46a7b8
--- /dev/null
+++ b/04/Exercise03.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main() {
+    int people[3] = {0};
+    for (int i = 0; i < 3; i++) {
+        people[i] = 1;
+        if ((people[1] == 1 || people[1] == 0) && (people[2] == 1 || people[2] == 0) && (people[2] == 0 || people[2] == 1)) {
+            printf("%d %d %d\n", people[0], people[1], people[2]);
+        }
+        people[i] = 0;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/04/Optional.c b/04/Optional.c
new file mode 100644
index 0000000..0d96068
--- /dev/null
+++ b/04/Optional.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main() {
+    int chicken[3] = {0};
+    for (int chick = 1; chick <= 100; chick++) {
+        for (int rooster = 1; rooster <= 100 - chick; rooster++) {
+            int hen = 100 - chick - rooster;
+            if ((hen > chicken[2]) && (chick*5 + rooster*10 + hen*15 == 1000)) {
+                chicken[0] = chick;
+                chicken[1] = rooster;
+                chicken[2] = hen;
+            }
+        }
+    }
+    printf("Chick: %d, Rooster: %d, Hen: %d", chicken[0], chicken[1], chicken[2]);
+    return 0;
+}
\ No newline at end of file