import math
def areaOfCirce(r):
if r <=0:
print('输入错误！')
else:
S = math.pi*r**2
return S
r = float(input("输入圆的半径:"))
S = areaOfCirce(r)
print(f"圆的面积是 {S:.2f}")
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beyond_24th
import math
def areaOfCirce(r):
if r <=0:
print('输入错误！')
else:
S = math.pi*r**2
return S
r = float(input("输入圆的半径:"))
S = areaOfCirce(r)
print(f"圆的面积是 {S:.2f}")