Python program to find the sum of natural numbers

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This is a python program to find the sum of natural numbers




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# python program to find the sum of natural numbers
# natural numbers up to n
# where n is provided by user
num = int(input("Enter a number: "))
if num <0:
    print("Enter a positive number")
else:
    sum = 0
    # is while loop to iterate until zero
    while(num>0):
        sum+=num
        num-=1
    print("The sum is",sum)

Output:

Enter a number: 10
The sum is 55

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