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:
