关于python3中的循环

Question

I gave the input 0 1 5 , the answer should be 5 but it is not showing me ... ,
help me out with the syntax

    a, b, c = [int(x) for x in input().split()]
    ans = None
    for i in range(3,c):
        ans=a + (b*b)
        a=b
        b=ans
        print ans

Answer 1

Your loop will run twice for i = 3, and i = 4.

The first run:

ans = 0 + 1 * 1 #1
a = 1
b = 1
print(1)

The second run:

ans = 1 + 1 * 1 # 2
a = 1
b = 2
print(2)

Now ans is 2. It's not clear why you think it should be 5.

Answer 2

I think this is what you are trying to do:

a, b, c = [int(x) for x in input().split()]
ans = None
for i in range(2,c):
    ans=a + (b*b)
    a=b
    b=ans
print (ans)

Note that for i in range(2,c) i will be 2 then 3 and then 4. It will not be 5 (=c) it stops at c-1.

Edit: if you just want the loop to run c times you can say for i in range(c) . This way it will run for i=0,1,2,...,c-1.

Answer 3

As per Python 3, print command syntax is print('your text') print(variable) print('your text ans: ',ans) Without semi-circular brackets print won't work. Refer: https://docs.python.org/3/whatsnew/3.0.html