Program to calculate sums of even and odd integers of first n natural numbers in python

```
n=int(input("Up to which natural number do you want to add? :"))
ctr=1
sum_even=sum_odd=0
while ctr<=n:
if ctr%2==0:
sum_even+=ctr
else:
sum_odd+=ctr
ctr+=1
print("The sum of even integers is",sum_even)
print("The sum of odd integers is",sum_odd)
```

Contents

#### Output

Up to which natural number do you want to add? :8

The sum of even integers is 20

The sum of odd integers is 16