期末財金程式設計588Python_Javascript網路執行_EXCEL_IRR二分法

pmt = [0,0,0,0] #常晏綺程式設計586設定串列list

pmt[0]=float(input('常晏綺躉繳金額: '))#float轉換成實數 float

for nper in range(1,4):

    pmt[nper] = float(input('第'+str(nper)+'期回收: '))

def npv(rate):

    y = - pmt[0]

    for j in range(1,4):

        y = y + pmt[j]/(1+rate)**j

    return y

a, b, gap, f = 0.0, 1.0, 9.0, 9.0

maxerror = 0.00000001

loopNumber = 1

while (gap > maxerror and abs(f) > maxerror and loopNumber < 100):

    loopNumber+=1

    c = (a+b)/2;

    f = npv(c);

    if ( abs(f) > maxerror and gap > maxerror):

        if ( f>0 ):

            a = c

        else:

           b = c

        gap = b-a;

print('常晏綺報酬率: ', c)

print('常晏綺淨現值: ', f)

print('常晏綺迴圈次數: ', loopNumber)