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27 lines
600 B
Python
27 lines
600 B
Python
import io
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import sys
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sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
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def pv_f(c, r, n, when=1):
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import numpy as np #导入numpy库
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c = np.array(c)
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r = np.array(r)
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if when == 1:
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n = np.arange(1, n + 1)
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else:
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n = np.arange(0, n)
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pv = c / (1 + r)**n
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return pv.sum()
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c = 20000
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r = 0.05
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n = 5
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#调用前文定义的函数pv_f(c,r,n,when=1)
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pv1 = pv_f(c, r, n, when=1)
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print("普通年金现值（年末）：%.2f" % pv1)
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#如果是预付年金，则when=0
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pv2 = pv_f(c, r, n, when=0)
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print("预付年金现值（年初）：%.2f" % pv2)
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