Python Program to Find Cube of a Number

The cube of a number is a simple mathematical operation where a number is multiplied by itself three times. In Python, there are multiple ways to find the cube of a number. In this article, we are going to discuss various approaches to calculating the cube of a number in Python.

What is the Cube of a Number?

The formula for finding the cube of a given number N is:

Cube = N × N × N or N³

Example 1

• Input: 5
• Output: 125

Explanation:

The cube of 5 is: 5 × 5 × 5 = 125

Example 2

• Input: 3
• Output: 27

Explanation:

The cube of 3 is: 3 × 3 × 3 = 27

Using Direct Multiplication

This is the simple and direct approach for finding the cube of a given number. In this approach, we multiply the number by itself three times ?

# Define the number
n = 5

# Calculate the cube using the formula
cube = n * n * n

# Output the result
print(f"The cube of the number {n} is: {cube}")

The cube of the number 5 is: 125

Using the Exponentiation Operator

In this approach, we use the exponential operator (**) of Python to raise a number to the power of 3 ?

# Define the number
n = 3

# Calculate the cube using exponentiation
cube = n ** 3

# Output the result
print(f"The cube of the number {n} is: {cube}")

The cube of the number 3 is: 27

Using the math.pow() Function

The math.pow() function from Python's math module can be used to calculate the power of numbers. To find the cube of a number, we use math.pow(n, 3) ?

import math

# Define the number
n = 3

# Calculate the cube using math.pow()
cube = math.pow(n, 3)

# Output the result
print(f"The cube of the number {n} is: {cube}")

The cube of the number 3 is: 27.0

Note: math.pow() returns a float value, so the result is 27.0 instead of 27.

Using a Function

We can define a function that accepts a number as an argument and returns its cube. This approach is reusable and allows us to calculate the cube of any number ?

# Function to calculate the cube
def calculate_cube(n):
    return n ** 3

# Call the function
n = 4
cube = calculate_cube(n)

# Output the result
print(f"The cube of the number {n} is: {cube}")

# Test with different numbers
numbers = [2, 3, 5, 7]
for num in numbers:
    print(f"Cube of {num} is: {calculate_cube(num)}")

The cube of the number 4 is: 64
Cube of 2 is: 8
Cube of 3 is: 27
Cube of 5 is: 125
Cube of 7 is: 343

Using a Loop (Multiplication)

This is an iterative approach where we use a loop to multiply the number by itself three times. While not the most efficient method, it demonstrates the iterative process ?

# Define the number
n = 3

# Initialize result variable
result = 1

# Loop to multiply the number by itself 3 times
for _ in range(3):
    result *= n

# Output the result
print(f"The cube of the number {n} is: {result}")

The cube of the number 3 is: 27

Comparison of Methods

Conclusion

Python provides multiple ways to calculate the cube of a number. The exponentiation operator (**) is the most readable and efficient approach for simple calculations. Use functions when you need reusability across your program.