From e9e46db307d17233c554630e3baae612dd912219 Mon Sep 17 00:00:00 2001
From: Henry Lin <huarui.lin@outlook.com>
Date: Fri, 22 Aug 2025 17:26:06 +0800
Subject: [PATCH] Add operator demo

---
 0004/operator.py | 67 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 0004/operator.py

diff --git a/0004/operator.py b/0004/operator.py
new file mode 100644
index 0000000..0abb96e
--- /dev/null
+++ b/0004/operator.py
@@ -0,0 +1,67 @@
+# 算术运算符
+print(5 + 3)  # 加法
+print(5 - 3)  # 减法
+print(5 * 3)  # 乘法
+print(5 / 3)  # 除法，结果为浮点数
+print(5 // 3) # 整除，结果为整数
+print(5 % 3)  # 取模（余数）
+print(5 ** 3) # 幂运算
+
+# 比较运算符
+print(5 == 3) # 等于
+print(5 != 3) # 不等于
+print(5 > 3)  # 大于
+print(5 < 3)  # 小于
+print(5 >= 3) # 大于等于
+print(5 <= 3) # 小于等于
+
+# 赋值运算符
+x = 5
+x += 3 # x = x + 3
+print(x)
+x -= 3 # x = x - 3
+print(x)
+x *= 3 # x = x * 3
+print(x)
+x /= 3 # x = x / 3
+print(x)
+x //= 3 # x = x // 3
+print(x)
+x %= 3 # x = x % 3
+print(x)
+x **= 3 # x = x ** 3
+print(x)
+
+# 逻辑运算符
+a = True
+b = False
+print(a and b) # 逻辑与
+print(a or b)  # 逻辑或
+print(not a)   # 逻辑非
+
+
+"""
+基础：计算表达式 7 + 3 * (10 / 2) 的结果。
+"""
+result = 7 + 3 * (10 / 2)
+print(result)
+
+"""
+应用：编写一个条件语句，判断一个数是正数、负数还是零。
+"""
+num = 10
+if num > 0:
+	print(f"{num}是正数")
+elif num == 0:
+	print(f"{num}是零")
+else:
+	print(f"{num}是负数")
+	
+"""
+挑战：使用逻辑运算符，编写一个表达式来判断一个年份是否是闰年（能被4整除且不能被100整除，或者能被400整除）。
+"""
+year = 2008
+if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
+    print(f"{year}是闰年") 
+else:
+    print(f"{year}是平年")
\ No newline at end of file