Sum of squares of each bit of a number

1. introduction
   It may be a simple thing to add the squares of each bit of a number in a mathematical problem , But after turning this problem into a programming problem ？ For example, this number has many digits ？ And what if this number is not just the square of each bit , It's going on 10 Inferior or 20 Power , Or how to solve this problem to a higher power ？

2. problem
   There is a function f(n), Please calculate by f(n)=n The sum of squares of each bit of . for example
   f (13) = 1^2+3^2, f (207) = 2^2+0^2+7^2

3. Method

   First set a function , From the keyboard n The numerical , Because I want to add the squares of each bit , So you can use a loop , yes sum=0 Reuse sum Add the sum of the squares of each bit , Back again sum Got it. f(n) Value . Or you can use a list , Using a loop , Add the square step by step to get f(n) Value .

4. Experimental results and discussion
   Through the experiment 、 Practice has proved that the proposed method is effective , Is able to solve the problem raised at the beginning .
   Code list 1

   （1） def f(n): n=input(‘ Please enter a positive integer :’)    sum=0    for x in n:        x=int(n)**2        sum=sum + x    return sum print(f(n)) （2） def f(n):    n=input(‘ Please enter a positive integer :’)    sum=0    while n>0:        s= len(str(n))        z=int(str(n)[s-1]) ** 2        s=s-1        sum=sum + z        if s<0:            break    return sum print(f(n))

5. Conclusion

Sometimes using mathematical thinking can only solve a small number of problems , When the data becomes large, it will become very complicated to use mathematical thinking , When using mathematical thinking, I will express the numerical value in the program as its single digit , ten , Hundred bit . If the value is tens of thousands , How to calculate hundreds of millions , This is the need to express it in the program , It's easy to think of values as a list , It can easily solve large numerical problems .