Learning Python- Intermediate course: Day 6, Math Exercises

In the last part we covered the math module. In this part, we will solve some questions related to it.

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Sample questions.

• Write a program to check if a number is an "Armstrong number" or not

def armstrong(x):
    a=str(x) #convert int to string to make it iteratable
    counter=0
    Sum=0
    for i in a:
        counter=counter+1

    for i in a:
        Sum=Sum+pow(int(i),counter)
    if(Sum==x):
        return True
    return False
print(armstrong(153))
print(armstrong(1723))

True
False

Alternative

def armstrong(x):
    n = 0
    i=x
    while (i != 0):
        n = n + 1
        i = i // 10
    temp = x
    Sum = 0
    while (temp != 0):
        r = temp % 10
        Sum = Sum + pow(r, n)
        temp = temp // 10
    return (Sum == x) #shorthand for if Sum==x return True else return False
print(armstrong(153))
print(armstrong(1723))

True
False

• Write the function power which returns the number raise to a power without using the math function pow()

def power(x, y):      
    if (y == 0):
        return 1
    if (y % 2 == 0):
        return power(x, y // 2) * power(x, y // 2)      
    return x * power(x, y // 2) * power(x, y // 2)
print(power(2,3))
print(pow(2,3))

8
8

Logic The function power is a function which makes use of recursion in Python. The power is raised using recursive multiplication.

Alternative-

def power(a, b):
    temp=a
    for i in range(1,b):
        temp=temp*a
    return temp
print(power(3,4))
print(pow(3,4))

81
81

Exercise.

Write the following functions without using their predefined math versions.

• hypot()
• sqrt()
• asinh()

Answers in the Learning Python Repository

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So friends that's all for this part. 😊 Hope you all are enjoying.😎 Please let me know in the comment section if you liked it or not. 🧐 And don't forget to like the post if you did. 😍 I am open to any suggestions or doubts. 🤠 Just post in the comments below or Gmail me. 😉
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