# -*- coding:utf-8 -*-

year =int(input("請輸入一個年份:"))

if (year % 4) == 0:
    if (year % 100) == 0:
        if (year % 400) == 0:
             print("是閏年")
        else:
            print("不是閏年")
    else:
        print("不是閏年")
else:
    print("不是閏年")

celsius = float(input("請輸入攝氏溫度:"))

fahrenheit = (celsius * 1.8) + 32
print("{}攝氏溫度轉華氏溫度為:{}".format(celsius,fahrenheit))

celsius = (fahrenheit - 32) / 1.8
print("{}華氏溫度轉攝氏溫度為:{}".format(fahrenheit,celsius))
 

a = float(input("請輸入邊長a:"))
b = float(input("請輸入邊長b:"))
c = float(input("請輸入邊長c:"))

while (abs(a - b) >= c or c >= abs(a + b)):
    c = float(input("請輸入邊長c:"))

s = (a + b + c) / 2

area = (s*(s-a)*(s-b)*(s-c)) ** 0.5

print("三角形的面積為:{}".format(area))

import cmath

a = float(input("輸入a:"))
b = float(input("輸入b:"))
c = float(input("輸入c:"))

d = (b**2) - (4 * b * c)

sol1 = (-b-cmath.sqrt(b))/(2*a)
sol2 = (-b+cmath.sqrt(b))/(2*a)

print("結果為:{}和{}".format(sol1,sol2))