Check if a list of integers contains only odd numbers in python

Python program to print odd numbers in a List

Given a list of numbers, write a Python program to print all odd numbers in given list.

Example:

Input: list1 = [2, 7, 5, 64, 14] Output: [7, 5] Input: list2 = [12, 14, 95, 3, 73] Output: [95, 3, 73]
  1. Using for loop : Iterate each element in the list using for loop and check if num % 2 != 0. If the condition satisfies, then only print the number.




    # Python program to print odd Numbers in a List
    # list of numbers
    list1 = [10, 21, 4, 45, 66, 93]
    # iterating each number in list
    for num in list1:
    # checking condition
    if num % 2 != 0:
    print(num, end = " ")

    Output:

    21 45 93
  2. Using while loop :




    # Python program to print odd Numbers in a List
    # list of numbers
    list1 = [10, 21, 4, 45, 66, 93]
    i = 0
    # using while loop
    while(i < len(list1)):
    # checking condition
    if list1[i] % 2 != 0:
    print(list1[i], end = " ")
    # increment i
    i += 1

    Output:

    21 45 93
  3. Using list comprehension :




    # Python program to print odd Numbers in a List
    # list of numbers
    list1 = [10, 21, 4, 45, 66, 93]
    only_odd = [num for num in list1 if num % 2 == 1]
    print(only_odd)

    Output:



    21 45 93
  4. Using lambda expressions :




    # Python program to print odd numbers in a List
    # list of numbers
    list1 = [10, 21, 4, 45, 66, 93, 11]
    # we can also print odd no's using lambda exp.
    odd_nos = list(filter(lambda x: (x % 2 != 0), list1))
    print("Odd numbers in the list: ", odd_nos)

    Output:

    Odd numbers in the list: [21, 45, 93, 11]

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How to check if a list contains only odd numbers in Java

In this shot, we will discuss how to check if a list of integers contains only odd numbers in Java.

If a number is not completely divisible by two, then it is considered an odd number. For such numbers, dividing them by two always leaves a remainder of one.

If the digit of the unit place of any number belongs to 1, 3, 5, 7, or 9 then the number is odd.

Example

11 is an odd number because dividing by two leaves 1 as a remainder. It is not completely divisible by 2. The 1 in the unit place indicates the number as odd.

Solution approach

We are going to create an isListOdd() function that takes a list of integers as input and returns true if all the elements in the list are odd. Otherwise, it returns false.

How to check if a list of integers contains only odd numbers

For this, you need to traverse through the list once and check whether each integer is completely divided by two or not. We can use a for loop or a for each loop for this. In this way, if it finds a number that is divisible by two in the list, it will simply return false.

Code

To understand this better let’s look at the code snippet.

To run the code, enter the size of the list first, followed by the elements of the list. Put a space between each integer.

Sample input: 4 3 5 7 9

Here the size of the list is four and the elements are 3, 5, 7, and 9.

import java.util.*; class OddElement { public static void main(String[] args) { Scanner sc= new Scanner(System.in); System.out.println("Enter the size of list"); int n= sc.nextInt(); List arr= new ArrayList<>(); for(int i=0;i arr) { for(int i:arr){ if(i%2==0) return false; } return true; } }

Enter the input below

Run

Explanation

  • In line 1, we import the java.util library.

  • In line 6, we take the input from the user and store it in a variable of int type size using the Scanner class of Java. This integer will be the size of the list.

  • In line 7, we initialize a list of integers of the ArrayList type.

  • In lines 8 to 10, we read integers as the input given by the user and then add them into the list.

  • In line 12, we call the isListOdd() function and pass the list of integers as a parameter. This function will return true if all the numbers in the list are odd; otherwise it will return false. The output will be printed based on what function returns.

  • In lines 19 to 26, we define the isListOdd() function. Inside the isListOdd() function, we run a for each loop . Inside the loop for each element, we are checking whether the number is divisible by two or not. If any one number is divisible by two, then the return value will be false.

  • In line 25, after ending the loop, the return value is true because there aren’t any even numbers in the list.

In this way, we can check if a list of integers contains only odd numbers in Java.

How Do You Print Odd Numbers From a List in Python?

To print odd numbers from a list of numbers you can use the Python modulo operator, related to the mathematical concept of remainder.

When you divide an odd number by 2 the remainder of the division is 1. When you divide an even number by 2 the remainder of the division is 0.

Let’s use this concept and a Python for loop to print odd numbers from a list.

def get_odd_numbers(numbers): odd_numbers = [] for number in numbers: if number % 2 == 1: odd_numbers.append(number) return odd_numbers

Before starting the for loop we define an empty list, then at every iteration of the for loop we add odd numbers to the list.

numbers = [2, 3, 6, 8, 13, 45, 67, 88, 99, 100] print(get_odd_numbers(numbers)) [output] [3, 13, 45, 67, 99]

Python program to print odd numbers in a List

In this tutorial, you will learn to write a program that will print all the odd numbers in a list. Odd numbers are the numbers that are not divisible by 2. We will use this property of odd numbers in our program. The concept of loops in Python and conditional statements in Python will be used in our program.

For a given list of numbers, the task is to find and print all the odd numbers in the list.

Input: [2, 7, 4, 10, 8, 6, 9]

Output: [7, 9]

Input: [11, 6, 2, 9, 10, 4, 26, 25]

Output: [11, 9, 25]

Python Program to Check if a Number is Odd or Even

In this example, you will learn to check whether a number entered by the user is even or odd.

To understand this example, you should have the knowledge of the following Python programming topics:

  • Python Operators
  • Python if...else Statement

A number is even if it is perfectly divisible by 2. When the number is divided by 2, we use the remainder operator % to compute the remainder. If the remainder is not zero, the number is odd.

Java Program to print Odd and Even Numbers from an Array

We can print odd and even numbers from an array in java by getting remainder of each element and checking if it is divided by 2 or not. If it is divided by 2, it is even number otherwise it is odd number.

Test it Now

Output:

Odd Numbers: 1 5 3 Even Numbers: 2 6 2
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