Python: Biggest even number between two numbers inclusive

Last update on May 30 2025 11:50:10 (UTC/GMT +8 hours)

Largest Even Number in Range

Write a Python program to find the biggest even number between two numbers inclusive.

Input:
m = 12
n = 51
Output:
50
Input:
m = 1
n = 79
Output:
78
Input:
m = 47
n = 53
Output:
52
Input:
m = 100
n = 200
Output:
200

Visual Presentation:

Sample Solution-1:

Python Code:

# Define a function named 'test' that takes two parameters, m and n
def test(m, n):
    # Check if m is greater than n or if both m and n are odd
    if m > n or (m == n and m % 2 == 1):
        # Return -1 if the condition is met
        return -1
    # Return n if n is even, otherwise return n - 1
    return n if n % 2 == 0 else n - 1

# Set values for m and n
m = 12
n = 51
# Print a message indicating the range of numbers
print("\nBiggest even number between", m, "and", n)
# Print the result of the test function applied to the given values of m and n
print(test(m, n))

# Set new values for m and n
m = 1
n = 79
# Print a message indicating the range of numbers
print("\nBiggest even number between", m, "and", n)
# Print the result of the test function applied to the new values of m and n
print(test(m, n))

# Set another set of values for m and n
m = 47
n = 53
# Print a message indicating the range of numbers
print("\nBiggest even number between", m, "and", n)
# Print the result of the test function applied to the new values of m and n
print(test(m, n))

# Set additional values for m and n
m = 100
n = 200
# Print a message indicating the range of numbers
print("\nBiggest even number between", m, "and", n)
# Print the result of the test function applied to the additional values of m and n
print(test(m, n))

Sample Output:

Biggest even number between 12 and 51
50

Biggest even number between 1 and 79
78

Biggest even number between 47 and 53
52

Biggest even number between 100 and 200
200

Flowchart:

Sample Solution-2:

Python Code:

# Define a function named 'test' that takes two parameters, p and q
def test(p, q):
    # Initialize a variable 'n' with the value of 'q'
    n = q
    # Continue looping while the least significant bit of 'n' is 1 (n is odd)
    while (n & 1) == 1:
        # Decrement 'n' by 1
        n -= 1
        # Check if 'n' has become less than 'p'
        if n < p:
            # Return -1 if the condition is met
            return -1
    # Return the final value of 'n'
    return n

# Set values for m and n
m = 12
n = 51
# Print a message indicating the range of numbers
print("\nBiggest even number between", m, "and", n)
# Print the result of the test function applied to the given values of m and n
print(test(m, n))

# Set new values for m and n
m = 1
n = 79
# Print a message indicating the range of numbers
print("\nBiggest even number between", m, "and", n)
# Print the result of the test function applied to the new values of m and n
print(test(m, n))

# Set another set of values for m and n
m = 47
n = 53
# Print a message indicating the range of numbers
print("\nBiggest even number between", m, "and", n)
# Print the result of the test function applied to the new values of m and n
print(test(m, n))

# Set additional values for m and n
m = 100
n = 200
# Print a message indicating the range of numbers
print("\nBiggest even number between", m, "and", n)
# Print the result of the test function applied to the additional values of m and n
print(test(m, n))

Sample Output:

Biggest even number between 12 and 51
50

Biggest even number between 1 and 79
78

Biggest even number between 47 and 53
52

Biggest even number between 100 and 200
200

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to compute the largest even number between two given bounds by decrementing from the upper bound.
• Write a Python program to use a while loop to find the maximum even integer in a given inclusive range.
• Write a Python program to generate a list of even numbers in the range and then select the maximum value.
• Write a Python program to implement a function that returns the largest even number between m and n using list comprehension.

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