Python Program to Print Largest Even and Largest Odd Number in a List

Given a list. The task is to print the largest even and largest odd number in a list.

Examples:

Input: 1 3 5 8 6 10 
Output:
Largest even number is  10 
Largest odd number is  5

Input: 123 234 236 694 809
Output:
Largest odd number is  809
Largest even number is  694

The first approach uses two methods , one for computing largest even number and the other for computing the largest odd number in a list of numbers, input by the user. Each of the methods prints the largest even and odd number respectively. We maintain one counter for each method, for current largest even or odd and check if the number is divisible by two or not . Accordingly, we print the largest values. 

Python3

class LargestOddAndEven:

    # find largest even number of
    # the list
    def largestEven(self, list):

        # counter for current largest
        # even number
        curr = -1

        for num in list:

            # converting number to integer
            # explicitly
            num = int(num)

            # even number is divisible by 2 and
            # if larger than current largest
            if(num % 2 == 0 and num > curr):

                # replace current largest even
                curr = num

        print("Largest even number is ", curr)

    # find largest odd number of the list
    def largestOdd(self, list):

        # current largest odd number
        currO = -1
        for num in list:

            # converting number to integer
            # explicitly
            num = int(num)

            # even number is divisible by 2 and
            # if larger than current largest
            if(num % 2 == 1 and num > currO):

                # replace current largest even
                currO = num

        print("Largest odd number is ", currO)

list_num = [1, 3, 5, 8, 6, 10]

# creating an object of class
obj = LargestOddAndEven()

# calling method for largest even number
obj.largestEven(list_num)

# calling method for largest odd number
obj.largestOdd(list_num)

Output:

Largest even number is  10
Largest odd number is  5

The second approach, uses an optimised version of first approach, where in we compute both the largest values in one method itself. We still maintain two counters, but the for loop that iterates over the list runs only once. 

Python3

class LargestOddAndEven:

    # find largest even number of the list
    def largestEvenandOdd(self, list):

        # counter for current largest even
        # number
        curr = -1

        # counter for current largest odd
        # number
        currO = -1
        for num in list:

            # converting number to integer
            # explicitly
            num = int(num)

            # even number is divisible by 2 and
            # if larger than current largest
            if(num % 2 == 0 and num > curr):

                # replace current largest even
                curr = num

            elif(num % 2 == 1 and num > currO):

                # replace current largest even
                currO = num

        print("Largest odd number is ", currO)
        print("Largest even number is ", curr)


# input a list of numbers
list_num = [123, 234, 236, 694, 809]

# creating an object of class
obj = LargestOddAndEven()

# calling method for largest even and odd number
obj.largestEvenandOdd(list_num)

Output:

Largest odd number is  809
Largest even number is  694

Method 3: Using list Comprehension and max function in python:

• Store even and odd numbers in separate lists using list comprehension.
• print max() of corresponding lists.

Below is the implementation of above approach:

Python3

# Python program for the above approach

def printmax(lis):

    # Using list comprehension storing
    # even and odd numbers as separate lists
    even = [x for x in lis if x % 2 == 0]
    odd = [x for x in lis if x % 2 == 1]

    # printing max numbers in corresponding lists
    print("Largest odd number is ", max(odd))
    print("Largest even number is ", max(even))


# Input a list of numbers
lis = [123, 234, 236, 694, 809]

printmax(lis)

# This code is contributed by vikkycirus

Output:

Largest odd number is  809

Largest even number is  694