2018-05-07

求sin(x)的值。其中sin(x)=x-x3/3!+x5/5!-x7/7!+x9/9!-…，循环次数越多就越精确。

x=float(input())
r=0
for i in range(1,20,2):
    m=1
    n=x**i
    for j in range(1,i+1):
        m=m*j
    if (i+1)%4==0:
        r=r-n/m
    else:
        r=r+n/m     
print(r)

求素数

for i in range(100,201):
    for j in range(2,i):
        if i%j==0:
            a=0
            break
        else:
            a=1
    if a==1 and (i-1)%10!=0:
        print(i)

斐波那契，迭代

def fib(n):
    if n==0:
        return 1
    elif n==1:
        return 1
    else:
        return fib(n-1)+fib(n-2)
list1=[]
for n in range(20):
    list1.append(fib(n))
print(list1)