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In this article, we've created some programs in Python, to find and print average of **n** numbers entered by
user at run-time. Here are the list of programs:

- Find Average of
**n**Numbers using**for loop** - using
**while loop** - using
**function** - using
**class and object**

For example, if the value of **n** entered by user is **5**. And five numbers entered as **10, 20 ,30, 40, 50**.
Then average of these numbers gets calculated as:

average = (10+20+30+40+50)/5 = (150/5) = 30

To find average or arithmetic mean of **n** numbers entered by user in Python, you have to ask from user to
enter the value of **n**, and then **n** set of numbers, find and print the average or arithmetic mean value of
all those numbers as shown in the program given below:

print("Enter the Value of n: ") n = int(input()) print("Enter " +str(n)+ " Numbers: ") nums = [] for i in range(n): nums.insert(i, int(input())) sum = 0 for i in range(n): sum = sum+nums[i] avg = sum/n print("\nAverage = ", avg)

Here is the initial output produced by this program:

Now supply inputs say **5** as value of **n** and then enter any five numbers say **12, 43, 54, 10**, and **23** one by
one. Press `ENTER`

key find and print the average value of given numbers as shown in the snapshot given below:

**Note - **The **str()** method converts any type of value to a string type value.

The dry run of following block of code:

for i in range(n): nums.insert(i, int(input()))

goes in this way:

- The loop variable
**i**starts with 0, since there is only one argument is given to**range()** - The value to
**range()**is the value of**n**. Therefore, if**5**is the value of**n**, then the loop gets executed 5 times with value of**i**from 0 to 4 - So at first execution of the loop, the statement,
**nums.insert(i, int(input()))**states that, the value entered by user gets inserted at**i**index of^{th}**nums** - That is, first value gets stored in
**nums[0]** - In similar way, the second, third, fourth, and fifth value gets stored in
**nums[1]**,**nums[2]**,**nums[3]**, and**nums[4]**respectively

This program uses **end=**, that is used to skip an automatic printing of newline using **print()**. The
**append()** method is also used to insert element to the list. Since, the inserting of element to list starts
with very first (zeroth) index, therefore better to use **append()**, instead of **insert()**

print("Enter the Value of n: ", end="") n = int(input()) print("Enter " +str(n)+ " Numbers: ", end="") arr = [] for i in range(n): arr.append(int(input())) sum = 0 for i in range(n): sum = sum+arr[i] if i==0: print(end="\n(" +str(arr[i])) elif i==(n-1): print(end="+" +str(arr[i])+ ")") else: print(end="+" +str(arr[i])) print(end="/" +str(n)+ " = ") avg = sum/n print(end=str(avg))

Here is its sample run with user input, **4** as value of **n** and **12, 32, 43, 54** as four numbers:

This program uses **while loop** to do the same task as of previous program. In this program, the value 0 to
**i** gets initialized to it, before starting the loop. And its value gets incremented from inside its body. Because,
*while loop* only contains the condition checking part.

print("Enter the Value of n: ", end="") n = int(input()) print("Enter " +str(n)+ " Numbers: ", end="") nums = [] i = 0 while i<n: nums.append(int(input())) i = i+1 sum = 0 i = 0 while i<n: sum = sum+nums[i] i = i+1 avg = sum/n print("\nAverage = ", avg)

Here is its sample run with user input, **4** as **n**'s value and **11, 22, 33, 44** as four numbers:

This program does the same job using a user-defined function named **avg()**. This function takes two
arguments. The first argument refers to the list (that contains **n** set of numbers). And the second argument
refers to the size of list (value of **n**). It returns the average value.

def avg(arr, tot): sum = 0 for i in range(n): sum = sum+arr[i] avg = sum/tot return avg print("Enter the Value of n: ", end="") n = int(input()) print("Enter " +str(n)+ " Numbers: ", end="") nums = [] for i in range(n): nums.append(int(input())) res = avg(nums, n) print("\nAverage = ", res)

This program produces the same output as of previous program.

This is the last program of this article, created using class and object, an object-oriented feature of Python.

class CodesCracker: def avg(self, arr, tot): sum = 0 for i in range(n): sum = sum+arr[i] avg = sum/tot return avg print("Enter the Value of n: ", end="") n = int(input()) print("Enter " +str(n)+ " Numbers: ", end="") nums = [] for i in range(n): nums.append(int(input())) obj = CodesCracker() res = obj.avg(nums, n) print("\nAverage = ", res)

From above program, the following statement:

obj = CodesCracker()

is used to assign all the properties of class **CodesCracker** to the object **obj**. So that, this object
can be used to access the member function (**avg()**) of the same class using **dot (.)** operator. Rest of the things works similar to a normal function.

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