From a4d375af418ebcfc43d79d722fe89228b95b134d Mon Sep 17 00:00:00 2001
From: LouisFonda <yigencong@yahoo.com>
Date: Sun, 14 Jul 2024 14:59:43 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=B7=BB=E5=8A=A0=E5=A5=87=E5=81=B6?=
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---
 tutorials/basic/13-function-even.sh | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 tutorials/basic/13-function-even.sh

diff --git a/tutorials/basic/13-function-even.sh b/tutorials/basic/13-function-even.sh
new file mode 100644
index 0000000..e3f966f
--- /dev/null
+++ b/tutorials/basic/13-function-even.sh
@@ -0,0 +1,22 @@
+#Program:
+# 编写一个函数判断一个数的奇偶性
+#History:
+# 2024/07/14 LouisFonda<yigencong@yahoo.com>
+
+# 函数is_even
+is_even () {
+  test $(expr $1 % 2) -eq 0 && return 0 || return 1
+}
+
+read -p "请输入一个整数：" num
+# 判断这个数是否合法
+if [ "$num" != "" ] && echo "$num" | grep -qE "^-?[0-9]+";then
+  if is_even $num;then
+    echo "这个数是偶数"
+  else 
+    echo "这个数是奇数"
+  fi  
+else
+  echo "输入的数值不和法，请输入整数"
+fi
+