Python Sum of Natural Numbers

Python Sum of Natural Numbers for beginners and professionals with programs on basics, controls, loops, functions, native data types etc.

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Python Program to Find the Sum of Natural Numbers

Natural numbers:

As the name specifies, a natural number is the number that occurs commonly and obviously in the nature. It is a whole, non-negative number.

Some mathematicians think that a natural number must contain 0 and some don't believe this theory. So, a list of natural number can be defined as:

 
N= {0, 1, 2, 3, 4, .... and so on}
N= {1, 2, 3, 4, .... and so on}

See this example:

num = int(input("Enter a number: "))

if num < 0:
   print("Enter a positive number")
else:
   sum = 0
   # use while loop to iterate un till zero
   while(num > 0):
       sum += num
       num -= 1
   print("The sum is",sum)

This example shows the sum of the first 100 positive numbers (0-100)

Output:

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Python Sum of Natural Numbers

Python Program to Find the Sum of Natural Numbers

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