diff --git a/tutorials/basic/13-function-even.sh b/tutorials/basic/13-function-even.sh
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+#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
+