Python的 - 兩個variabels不加在一起

Question

你好，我是新來的蟒蛇，我試圖讓一個程序，做了二次公式，但由於某種原因，它不會增加兩個變量共同

#The Quadratic Formula Calculator 
from cmath import sqrt 

a = (int(input('Enter the value of A : '))) 
b = (int(input('Enter the value of B : '))) 
c = (int(input('Enter the value of C : '))) 

def state_formula(): 
print('Calculating') 

btimesb = b * b 
print('First step is done, the value is', btimesb) 

fourac = -4 * a * c 
print ('The second step is done, the value is', fourac) 

squareit = sqrt(btimesb + fourac) 
print('The third step is done, the value is', squareit) 

negativeb = -b 
print('The fourth step is done, the value is', negativeb) 

addthemplus = negativeb + squareit 
print('The fith step is done, the value is', addthemplus) 

和我它出來作爲

Enter the value of A : 3 
Enter the value of B : 3 
Enter the value of C : 3 
First step is done, the value is 9 
The second step is done, the value is -36 
The third step is done, the value is 5.196152422706632j 
The fourth step is done, the value is -3 
The fith step is done, the value is (-3+5.196152422706632j) 

我想知道，爲什麼第五步實際上並沒有將兩者結合起來，我試圖將其轉換爲浮動，並沒有讓我。

Answer 1

您正在計算負值的sqrt。結果不是真實的，而是虛數。

結果所有以下計算都是以複數完成的。當看到-3 + 5.196152422706632j等結果時，表示由實數（-3）和虛數部分組成的複數，如j所示，等於5.196152422706632。