In this post, we will see programs for how to print odd natural numbers up to n in python, provided n is positive.

Odd Number : Any integer either positive or negative, which can not be divided exactly by 2 is an odd number. The numbers having the last digit is 1, 3, 5, 7 or 9 are considered as an odd number.

Note : Natural number is positive integers. It’s range from 1 to infinity.

Examples:

Input: n : 10

Output: 1 3 5 7 9

Input: n : 15

Output: 1 3 5 7 9 11 13 15

Let’s see the different version of codes for this program :

Code version 1: Using a concept of range() function with for loop.

As we know, we can pass 3 parameters in range() function, the third parameter is stepped i.e jump after each iteration.

# main code
if __name__ == "__main__" :

    # input value of n
    n = 10

    # for loop starts from 1
    # and ends on n.
    # each time value of variable  
    # i is incremented by 2
    for i in range(1, n + 1, 2) :
        
        # print value of variable i
        # and end parameter is space
        # so print all outputs
        # in a single line
        print(i,end=" ")

Output: 1 3 5 7 9

Code version 2: Using if statement along with for loop.

 

# main code
if __name__ == "__main__" :

    # input value of n
    n = 15

    # for loop starts from 1
    # and ends on n.
    # each time value of variable  
    # i is incremented by 1
    for i in range(1, n + 1) :

        # if condition is True 
        # that means i % 2 gives 
        # non-zero value then
        # i is odd number so, 
        # print value of variable i
        # and end parameter is space
        # so print all outputs
        # in a single line
        if i % 2 :
            print(i,end=" ")
            

Output: 1 3 5 7 9 11 13 15

Code version 3: Using a concept of increment operator with while loop .

# main code
if __name__ == "__main__" :

    # input value of n
    n = 20

    # initialize value of i by 1
    i = 1
    
    # while loop starts from 1
    # run untill value of i
    # is less than n  
    while i < n :
        
        # print value of variable i
        # and end parameter is space
        # so print all outputs
        # in a single line
        print(i,end=" ")

        # each time value of variable  
        # i is incremented by 2
        i += 2

Output: 1 3 5 7 9 11 13 15 17 19