In this article, we will learn about python program to find largest among n Numbers with examples. We will see different built-in method to achieve this task.

Getting Started

The task is to find the maximum number among N given numbers using python program. For example,

If a = 4.1, b = 6.3, c = 6.7 and d = 7.4, then output should be d = 7.4

We can do it in below ways –

1. Using if-else Condition
2. Using max() Function
3. Using reduce() Function
4. Using sorted() Function

Using if-else Condition

We can simply compare value using if-else and write python program to find largest among N numbers as shown below –

def findLargest(numbers):
    if not numbers:
        return None

    largest = numbers[0]

    for num in numbers:
        if num > largest:
            largest = num

    return largest

# Take input from user
n = int(input("Enter the number of elements: "))
elements = []
for i in range(n):
    element = float(input(f"Enter element {i + 1}: "))
    elements.append(element)

result = findLargest(elements)
print("The largest number is:", result)

Here,

• Inside findLargest function, we have use a python for loop.
• At first, defined a variable largest to store largest value. Initially, it is initialized with first element of list numbers.
• Then, run a for loo. In each iteration, we are comparing if current number is greater than value stored in largest variable. If yes, we are overriding the value in largest variable. If no, we move to next iteration.
• Finally, value stored in largest variable is returned and printed using print() function.

Output:

Enter the number of elements: 
5
Enter element 1: 
1.2
Enter element 2: 
5.3
Enter element 3: 
6.3
Enter element 4: 
8.7
Enter element 5: 
9.3
The largest number is: 9.3

Using max() Function

We can also use max() function to find maximum number among N numbers in python as shown below –

# Take input from user
n = int(input("Enter the number of elements: "))
elements = []
for i in range(n):
    element = float(input(f"Enter element {i + 1}: "))
    elements.append(element)

# Find maximum using max() function
result = max(elements)
print("The largest number is:", result)

Here,

• At first, we take N numbers of input using input() method. Then, we convert it into list and store in elements variable.
• Then, we use max() function to return maximum element among these input numbers.
• Finally, result is printed using print() Function.

Output:

Enter the number of elements: 
8
Enter element 1: 
1.2
Enter element 2: 
5.3
Enter element 3: 
-2.4
Enter element 4: 
6.34
Enter element 5: 
0.45
Enter element 6: 
23.5
Enter element 7: 
25.78
Enter element 8: 
23.46
The largest number is: 25.78

Using reduce() Function

We can also use reduce() function present inside functools module to write python program to find largest among N numbers as shown below –

from functools import reduce

# Take input from user
n = int(input("Enter the number of elements: "))
elements = []
for i in range(n):
    element = float(input(f"Enter element {i + 1}: "))
    elements.append(element)

# Find maximum using reduce() function
result = reduce(lambda x, y: x if x > y else y, elements)
print("The largest number is:", result)

Here,

• At first input is taken using input() function and converted to list and stored in elements variable.
• After that, we use reduce() function to find the maximum element among these input numbers.
• Finally, maximum number is returned by reduce() function and stored in result variable.
• Then, we print this maximum number using print() function.

Output:

Enter the number of elements: 
6
Enter element 1: 
1.7
Enter element 2: 
8.5
Enter element 3: 
9.56
Enter element 4: 
46.56
Enter element 5: 
0.98
Enter element 6: 
4.6
The largest number is: 46.56

Using sorted() Function

We can also use sorted() function to write python program to find largest among N numbers as shown below –

from functools import reduce

# Take input from user
n = int(input("Enter the number of elements: "))
elements = []
for i in range(n):
    element = float(input(f"Enter element {i + 1}: "))
    elements.append(element)

# Find maximum using max() function
result = sorted(elements)[-1]
print("The largest number is:", result)

Here,

• We can N numbers of elements from user, then covert them into list and store in elements variable.
• After that, we use sorted() function. sorted() function sorts the elements in ascending order. Then, we get last number in sorted order using [-1] indexing.
• Finally, result is printed using print() function.

Output:

Enter the number of elements: 
8
Enter element 1: 
1.2
Enter element 2: 
7.5
Enter element 3: 
4.3
Enter element 4: 
6.8
Enter element 5: 
9.8
Enter element 6: 
34.2
Enter element 7: 
5.4
Enter element 8: 
65.76
The largest number is: 65.76

Thus, we can write python program to find largest among N numbers using if-else, built-in methods such as reduce(), max() and sorted() functions.

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