Python Exercise: Calculate the sum and average of n integer numbers

Last update on April 17 2025 12:58:13 (UTC/GMT +8 hours)

42. Sum and Average of n Integers

Write a Python program to calculate the sum and average of n integer numbers (input from the user). Input 0 to finish.

Pictorial Presentation:

Python Code:

# Display a prompt asking the user to input integers to calculate their sum and average,
# specifying that entering 0 will exit the program
print("Input some integers to calculate their sum and average. Input 0 to exit.")

# Initialize variables for count, sum, and the first number to 1
count = 0
sum = 0.0
number = 1

# Iterate until the user inputs 0
while number != 0:
    # Prompt the user to input a number and convert it to an integer
    number = int(input(""))
    
    # Add the entered number to the sum
    sum = sum + number
    
    # Increment the count of entered numbers
    count += 1

# Check if no numbers were entered
if count == 0:
    print("Input some numbers")
else:
    # Calculate and display the average and sum of the entered numbers
    print("Average and Sum of the above numbers are: ", sum / (count-1), sum)
	

Sample Output:

Input some integers to calculate their sum and average. Input 0 to exit
.                                                                      
15                                                                     
16                                                                     
12                                                                     
0                                                                      
Average and Sum of the above numbers are:  14.333333333333334 43.0 

Flowchart :

Calculates the average of two or more numbers.

Use sum() to sum all of the args provided, divide by len().

Python Code:

# Define a function 'average' that takes in a variable number of arguments using *args
def average(*args):
    # Calculate the sum of the arguments using the built-in 'sum' function, starting from 0.0 as the initial value
    # Divide the sum by the number of arguments using 'len(args)' to compute the average
    return sum(args, 0.0) / len(args)

# Print the average of the elements within the list [1, 2, 3, 4] by unpacking it with '*'
print(average(*[1, 2, 3, 4]))

# Print the average of the numbers 1, 2, and 3 by passing them directly as arguments to the 'average' function
print(average(1, 2, 3)) 

Sample Output:

2.5
2.0

Flowchart :

For more Practice: Solve these Related Problems:

• Write a Python program to repeatedly accept integers from the user until 0 is entered, then output their sum and average.
• Write a Python program to accumulate a list of integers entered by the user and compute both total and mean when the input terminates.
• Write a Python program to implement a loop that reads integers until 0 and then calculates and prints the sum and average.
• Write a Python program to use a while loop to collect integers from user input, then compute the sum and average after the loop exits on 0.

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