Python program to get input n and calculate the sum of odd numbers till n
Sample Input 1:
5
Sample Output 1:
9[1+3+5]
Program or Solution
n=int[input["Enter n value:"]]
sum=0
for i in range[1,n+1,2]:
sum+=i
print[sum]
Program Explanation
For Statement is used to execute the sequence of instruction repeatedly.
Range[] method gives list of elements, here range[] method gives list which has 1,3,5... to n or n-1. for statement executes the instructions iteratively and for takes the elements one by one as value of i in sequential manner.
so it adds odd numbers.
The following article shows how given an integer list, we can produce the sum of all its odd and even digits.
Input : test_list = [345, 893, 1948, 34, 2346] Output : Odd digit sum : 36 Even digit sum : 40 Explanation : 3 + 5 + 9 + 3 + 1 + 9 + 3 + 3 = 36, odd summation.
Input : test_list = [345, 893] Output : Odd digit sum : 20 Even digit sum : 12 Explanation : 4 + 8 = 12, even summation.
Method 1 : Using loop, str[] and int[]
In this, we first convert each element to string and then iterate for each of its element, and add to respective summation by conversion to integer.
Python3
test_list = [345, 893, 1948, 34, 2346]
print["The original list is : "
+ str[test_list]]
odd_sum = 0
even_sum = 0
for sub in test_list:
for ele in str[sub]:
if int[ele] % 2 == 0:
even_sum += int[ele]
else:
odd_sum += int[ele]
print["Odd digit sum : " + str[odd_sum]]
print["Even digit sum : "
+ str[even_sum]]
Output
The original list is : [345, 893, 1948, 34, 2346] Odd digit sum : 36 Even digit sum : 40
Method 2: Using loop and sum[]
In this, we perform task of getting summation using sum[], and loop is used to perform the task of iterating through each element.
Python3
test_list =
[345, 893, 1948, 34, 2346]
print["The original list is : " + str[test_list]]
odd_sum = 0
even_sum = 0
for sub in test_list:
odd_sum += sum[[int[ele] for ele in str[sub] if int[ele] % 2 ==
1]]
even_sum += sum[[int[ele] for ele in str[sub] if int[ele] % 2 == 0]]
print["Odd digit sum : " + str[odd_sum]]
print["Even digit sum : " + str[even_sum]]
Output
The original list is : [345, 893, 1948, 34, 2346] Odd digit sum : 36 Even digit sum : 40
Method 3: Using list comprehension
Python3
test_list = [345, 893, 1948, 34, 2346]
odd_sum = 0
even_sum = 0
odd_sum += sum[[int[ele]
for sub in test_list for ele in str[sub] if int[ele] % 2 == 1]]
even_sum += sum[[int[ele]
for
sub in test_list for ele in str[sub] if int[ele] % 2 == 0]]
print["Odd digit sum : " + str[odd_sum]]
print["Even digit sum : " + str[even_sum]]
Output
Odd digit sum : 36 Even digit sum : 40
Method 4: Using the enumerate function
Python3
test_list =
[345, 893, 1948, 34, 2346]
odd_sum = 0
even_sum = 0
odd_sum += sum[[int[ele] for i, sub in enumerate[test_list]
for ele in str[sub] if int[ele] % 2 == 1]]
even_sum +=
sum[[int[ele] for i, sub in enumerate[test_list]
for ele in str[sub] if int[ele] % 2 == 0]]
print["Odd digit sum : " + str[odd_sum]]
print["Even digit sum : " + str[even_sum]]
Output
Odd digit sum : 36 Even digit sum : 40