# Adding elements from the inputted list

74
December 10, 2019, at 10:40 PM

Hey guys just a newb question about adding elements from the loop. I wanted to get the sum of the list of elements depending on the number the user inputted but I really dont know what kinda syntax or anything to make it display only the sum of the list, I know that I just have to declare a variable that equates it to the sum of the list, but my real question here is how to get the sum of the elements from the list.

``````b=int(input("Enter the value of N: "))
for num in range (1,b,2):
print("Sum of odd numbers from 1 to",b,"is",num)
``````

output:

``````Enter the value of N: 5
Sum of odd numbers from 1 to 5 is 1
Sum of odd numbers from 1 to 5 is 3
``````

output I need:

``````Enter the value of N:5
Sum of odd numbers from 1 to 5 is 9
``````

I needed the output to be 9 since 1+3+5, which are odd numbers are the ones I needed to be summed, which came from the list.

You should add the numbers and then print them.

``````    b=int(input("Enter the value of N: "))
sum=0
for num in range (1,b+1,2):
sum+=num
print("Sum of odd numbers from 1 to",b,"is",sum)
``````

If you want to make it quicker you can use the closed formula for the sum of the first n odd integers, i.e.

Then your program would look like:

``````b=int(input("Enter the value of N: "))
if b % 2 == 1:
s = ((b+1)//2)**2
else:
s = (b//2)**2
print('The sum of the odd integers from 1 to', b, 'is', s)
``````
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