In the previous article, we have discussed Python Program for Comma-separated String to Tuple

Given a number, and the task is to find the greatest digit in a given number.

Example: Let the number is 149.

The greatest digit in a given number is ‘9’

**Examples:**

**Example1:**

**Input:**

Given number = 639

**Output:**

The maximum digit in given number { 639 } = 9

**Example2:**

**Input:**

Given number = 247

**Output:**

The maximum digit in given number { 247 } = 7

- Python Program to Find the 2nd Largest Digit in a Given Number
- Python Program to Rearrange the given Number to form the Smallest Number
- Python Program to Calculate Seed of a Number

## Program to Find the Greatest Digit in a Number.

Below are the ways to find the greatest digit in a given number.

### Method #1: Using list() Function (Static input)

**Approach:**

- Give the number as static input and store it in a variable.
- Convert the given number into the string using the str() function and store it in another variable.
- Convert the above-obtained string number into a list of digits using the built-in list() method and store it in another variable.
- Find the maximum list of digits using the built-in max() function and store it in another variable.
- Print the greatest digit in a given number.
- The Exit of the program.

**Below is the implementation:**

# Give the number as static input and store it in a variable. gvn_num = 154 # Convert the given number into string using str() function and # store it in another variable. str_numbr = str(gvn_num) # Convert the above obtained string number into list of digits using bulit-in list() # method and store it in another variable. lst = list(str_numbr) # Find the maximum of list of digits using bulit-in max() function # and store it in another variable. maxim_digit = max(lst) # Print the greatest digit in a given number. print("The maximum digit in given number {", gvn_num, "} = ", maxim_digit)

**Output:**

The maximum digit in given number { 154 } = 5

### Method #2: Using list() Function (User input)

**Approach:**

- Give the number as user input using the int(input()) function and store it in a variable.
- Convert the given number into the string using the str() function and store it in another variable.
- Convert the above-obtained string number into a list of digits using the built-in list() method and store it in another variable.
- Find the maximum list of digits using the built-in max() function and store it in another variable.
- Print the greatest digit in a given number.
- The Exit of the program.

**Below is the implementation:**

#Give the number as user input using int(input()) and store it in a variable. gvn_num = int(input("Enter some random number = ")) # Convert the given number into string using str() function and # store it in another variable. str_numbr = str(gvn_num) # Convert the above obtained string number into list of digits using bulit-in list() # method and store it in another variable. lst = list(str_numbr) # Find the maximum of list of digits using bulit-in max() function # and store it in another variable. maxim_digit = max(lst) # Print the greatest digit in a given number. print("The maximum digit in given number {", gvn_num, "} = ", maxim_digit)

**Output:**

Enter some random number = 183 The maximum digit in given number { 183 } = 8

Explore more instances related to python concepts from Python Programming Examples Guide and get promoted from beginner to professional programmer level in Python Programming Language.