Calculate the sum of natural numbers in Python

Calculate the sum of natural numbers in Python

In this tutorial, we will discuss a concept of Python program to calculate the sum of natural numbers using loops

In this article, we are going to learn  how to  find the sum of natural numbers using loops in the Python programming language

Python program to find the sum of natural numbers using loop

Python code to find the sum of numbers using for loop

Program 1

This program takes input from the user and stores in variable num. Then, the for loop is used to calculate the sum of natural numbers up to the given number.

#Python program to calculate sum of natural numbers
num=input("Enter numbet to calculate sum: ")
#received input from the user
num=int(num)
sum=0;

for number in range(0,num+1,1):
    sum=sum+number
print("Sum of first ",num,"natural numbers is:",sum )

When the above code is executed, it produces the following results

Enter numbet to calculate sum: 20
Sum of first 20 natural numbers is: 210

Program 2

This program takes input from the user and stores in variable num. Then, the while loop is used to calculate the sum of natural numbers up to the given number

#Python program to calculate sum of natural numbers
num=input("Enter numbet to calculate sum: ")
num=int(num)
sum=0;

if num<0:
    print("Enter a positive number")

    
else:
  while(num>0):
     sum=sum+num
     num-=1;
print("Sum is:",sum )

When the above code is executed, it produces the following results

Enter numbet to calculate sum: 10
Sum is: 55

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