jackfrued / jackfrued/Python-100-Days
day3练习有误-输入三条边长，如果能构成三角形就计算周长和面积
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Description
练习3：输入三条边长，如果能构成三角形就计算周长和面积。
原代码：
"""
判断输入的边长能否构成三角形，如果能则计算出三角形的周长和面积
Version: 0.1
Author: 骆昊
"""
a = float(input('a = '))
b = float(input('b = '))
c = float(input('c = '))
if a + b > c and a + c > b and b + c > a:
print('周长: %f' % (a + b + c))
p = (a + b + c) / 2
area = (p * (p - a) * (p - b) * (p - c)) ** 0.5
print('面积: %f' % (area))
else:
print('不能构成三角形')
除了考虑两边之和大于第三边，也要考虑，两边之差小于第三边
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Research direction
Search the repository for the exercise 3 Python snippet included in the issue and inspect its triangle-validation condition. Update the exercise to reflect the requested validity rules, then run it with valid and invalid side lengths and confirm the appropriate perimeter, area, or rejection output.
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