Python Program to Find Largest of 3 Numbers

Python program to find the largest among 3 numbers. We will discuss different methods to find the largest of 3 numbers. We will give three numbers num1, num2, and num3. Python program will find the greatest of three numbers using various methods.

How to find largest of three numbers.

  • If num1 >= num2 and num3 then num1 is largest number.
  • else if num2 >= num1 and num3 then num2 is largest number.
  • else num3 will be >= num1 and num2 and therefore num3 is largest number.

Mathematically,

num1 = 5, num2 = 8, and num3 = 7

Output:- 8 is the largest number.

Now, let’s see how we can find the largest of three numbers in python.

Python Program to Find the Largest among Three Numbers

This is the simplest and easiest way to find the largest among three numbers program in Python. We will take three numbers while declaring the variables. Find the largest number using the if-else statement and its value will be stored to the largest variable. Finally, it will be displayed on the screen.

Program description:- Write a Python program to find largest of three numbers

# Python program to find largest of 3 numbers

# take inputs
num1 = 5
num2 = 3
num3 = 9

# find largest numbers
if (num1 >= num2) and (num1 >= num3):
    largest = num1
elif (num2 >= num1) and (num2 >= num3):
    largest = num2
else:
    largest = num3

# display result
print('The largest number = ', largest)

Output:-

The largest number = 9

In this program, we have hardcoded the values of numbers num1, num2, and num3 in the source code, 5, 3, and 9 numeric values are assigned to them.

num1 = 5
num2 = 3
num3 = 9

Find the largest number using if-else statement.

if (num1 >= num2) and (num1 >= num3):
    largest = num1
elif (num2 >= num1) and (num2 >= num3):
    largest = num2
else:
    largest = num3

Finally, display the largest number of those numbers using print() function.

print('The largest number = ', largest)

Write a Program to Find the largest of Three Numbers in Python

In the previous program, inputs are hardcoded in the program but in this program, inputs will be provided by the user.

# Python program to find the largest of three numbers

# take inputs
num1 = float(input('Enter first number: '))
num2 = float(input('Enter second number: '))
num3 = float(input('Enter third number: '))

# find largest numbers
if (num1 >= num2) and (num1 >= num3):
    largest = num1
elif (num2 >= num1) and (num2 >= num3):
    largest = num2
else:
    largest = num3

# display result
print('The largest number = ', largest)

Output for the different input values:-

Enter first number: 7
Enter second number: 15
Enter third number: 4
The largest number = 15.0

Enter first number: 25
Enter second number: 23
Enter third number: 97
The largest number = 97.0

In this program, inputs are scanned using the input() function and stored in variable num1, num2, and num3.

num1 = float(input('Enter first number: '))
num2 = float(input('Enter second number: '))
num3 = float(input('Enter third number: '))

Find the largest number using the if-else statement and Finally, display the largest number of those numbers using the print() function.

Largest among Three Numbers using max() Function

In this program, We can find the largest number of three numbers using the max() function. max() function will be imported from the library function.

# Python program to find the largest among 
# three numbers using max() function

# take inputs
num1 = float(input('Enter first number: '))
num2 = float(input('Enter second number: '))
num3 = float(input('Enter third number: '))

# find largest numbers and display result
print('The largest number = ', max(num1, num2, num3))

Output:-

Enter first number: 15
Enter second number: 10
Enter third number: 19
The largest number = 19.0

Program to Find Greatest of Three Numbers in Python using Function

We can also take the help of a function to find the average of 3 numbers in python. A function is a block of code that performs a specific task.

# Python program to find greatest of three numbers using function

def findLargest(num1, num2, num3):  #user-defined function
    # find largest numbers
    if (num1 >= num2) and (num1 >= num3):
        largest = num1
    elif (num2 >= num1) and (num2 >= num3):
        largest = num2
    else:
        largest = num3
    return largest  #return value

# take inputs
num1 = float(input('Enter first number: '))
num2 = float(input('Enter second number: '))
num3 = float(input('Enter third number: '))

# function call
maximum = findLargest(num1, num2, num3)

# display result
print('The largest number = ',maximum)

Output:-

Enter first number: 4
Enter second number: 8
Enter third number: 7
The largest number = 8.0

In this program, we will be the first defined function.

def findLargest(num1, num2, num3):  #user-defined function
    # find largest numbers
    if (num1 >= num2) and (num1 >= num3):
        largest = num1
    elif (num2 >= num1) and (num2 >= num3):
        largest = num2
    else:
        largest = num3
    return largest  #return value

Inputs are scanned using the input() function and stored in variable num1, num2 and num3. Then call the function and print the largest number of those numbers.

Also See:- Find the Average of 3 Numbers in Python

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