Write a Python Program to Count Even and Odd Numbers in a List using For Loop, While Loop, and Functions with a practical example.

## Python Program to Count Even and Odd Numbers in a List using For Loop

In this program, we are using For Loop to iterate every element in a given List. Inside the loop, we are using the If statement to check and count Even and odd numbers.

NumList = [] Even_count = 0 Odd_count = 0 Number = int(input("Please enter the Total Number of List Elements: ")) for i in range(1, Number + 1): value = int(input("Please enter the Value of %d Element : " %i)) NumList.append(value) for j in range(Number): if(NumList[j] % 2 == 0): Even_count = Even_count + 1 else: Odd_count = Odd_count + 1 print("\nTotal Number of Even Numbers in this List = ", Even_count) print("Total Number of Odd Numbers in this List = ", Odd_count)

In this python program, the User entered List elements = [2, 3, 5, 7], Even_count = 0, Odd_count = 0

For Loop – First Iteration: for 0 in range(0, 4)

The condition is True. So, it enters into the If Statement

if(NumList[0] % 2 == 0) => if(2 % 2 == 0) – Condition is True

Even_count = Even_count + 1 => 0 + 1 = 1

Second Iteration: for 1 in range(0, 4) – Condition is True

if(NumList[1] % 2 == 0) => if(3 % 2 == 0) – Condition is False

So, it enters into the Else block.

Odd_count = Odd_count + 1 => 0 + 1 = 1

Third Iteration: for 2 in range(0, 4) – Condition is True

if(NumList[2] % 2 == 0) => if(5 % 2 == 0) – Condition is False and enters into the Else block.

Odd_count = 1 + 1 = 2

Fourth Iteration: for 3 in range(0, 4) – Condition is True

if(7 % 2 == 0) – Condition is False and enters into the Else block.

Odd_count = 2 + 1 = 3

Fifth Iteration: for 4 in range(4) – Condition is False. So, it exits from For Loop

## Python Program to Count Even and Odd Numbers in a List using While loop

This program for counting even and odd numbers is the same as the above. We just replaced the Python For Loop with the While loop.

NumList = [] Even_count = 0 Odd_count = 0 j = 0 Number = int(input("Please enter the Total Number of List Elements: ")) for i in range(1, Number + 1): value = int(input("Please enter the Value of %d Element : " %i)) NumList.append(value) while(j < Number): if(NumList[j] % 2 == 0): Even_count = Even_count + 1 else: Odd_count = Odd_count + 1 j = j + 1 print("\nTotal Number of Even Numbers in this List = ", Even_count) print("Total Number of Odd Numbers in this List = ", Odd_count)

```
Please enter the Total Number of List Elements: 5
Please enter the Value of 1 Element : 12
Please enter the Value of 2 Element : 13
Please enter the Value of 3 Element : 14
Please enter the Value of 4 Element : 15
Please enter the Value of 5 Element : 44
Total Number of Even Numbers in this List = 3
Total Number of Odd Numbers in this List = 2
```

## Python Program to Count Even and Odd Numbers in a List using Functions

This count even and odd list numbers program is the same as the first example. However, we separated the logic using Functions.

def count_even(NumList): Even_count = 0 for j in range(Number): if(NumList[j] % 2 == 0): Even_count = Even_count + 1 return Even_count def count_odd(NumList): Odd_count = 0 for j in range(Number): if(NumList[j] % 2 != 0): Odd_count = Odd_count + 1 return Odd_count NumList = [] Number = int(input("Please enter the Total Number of List Elements: ")) for i in range(1, Number + 1): value = int(input("Please enter the Value of %d Element : " %i)) NumList.append(value) even_cnt = count_even(NumList) odd_cnt = count_odd(NumList) print("\nTotal Number of Even Numbers in this List = ", even_cnt) print("Total Number of Odd Numbers in this List = ", odd_cnt)

```
Please enter the Total Number of List Elements: 6
Please enter the Value of 1 Element : 12
Please enter the Value of 2 Element : 22
Please enter the Value of 3 Element : 33
Please enter the Value of 4 Element : 44
Please enter the Value of 5 Element : 55
Please enter the Value of 6 Element : 66
Total Number of Even Numbers in this List = 4
Total Number of Odd Numbers in this List = 2
```