Python program to sum of Natural number from 1 to n|4 ways

Python program to sum of Natural number from 1 to n

In this tutorial, we will discuss the Python program to the sum of Natural number from 1 to n

In this post, we are going to learn how to find the sum of natural numbers in python language in different 4 ways.

Program to the sum of Natural number – using for loop

Program 1

#Python program to find sum of natural numbers 1 to givrn number
n=input("Enter the number to calculate sum: ")
n=int(n)
sum=0;
for num in range(0,n+1,1):
    sum=sum+num

print("Sum of 1 to ",n,"numbers is: ",sum)

When the above code is executed it produces the following output

Enter the number to calculate sum: 25
Sum of 1 to  25 'numbers is:  325

This program allows the user to enter a maximum number. and it displays the sum of natural numbers from 1 to given number using for loop in Python language

Program to the sum of Natural number – using the while loop

Program 2

#Python program to find sum of natural numbers 1 to givrn number
num=input("Enter a positive number to calculate sum: ")
num=int(num)
sum=0;
while (num>0):
    sum=sum+num #sum+=num

    num-=1

print("Sum of 1 to ",num,"numbers is: ",sum)

When the above code is executed it produces the following output

Enter a positive number to calculate sum: 15
Sum of 1 to  15 numbers is:  120

This program allows the user to enter a maximum number. and it displays the sum of natural numbers from 1 to given number using while loop in Python language

Program to the sum of Natural number – using the function

Program 3

#Python program to find sum of natural numbers 1 to givrn number
def sum_Num(num): #function defivition
  if(num==0):
      return num
  else:
      return(num*(num+1)/2)
number=input("Enter a positive number to calculate sum: ")
number=int(number)
sum= sum_Num(number)#function call

print("Sum of Natural numbers from 1 to {0}={1}".format(number,sum))
#display the result

When the above code is executed it produces the following output

Enter a positive number to calculate sum: 25
Sum of Natural numbers from 1 to 25=325

This program allows the user to enter a maximum number. and it displays the addition of natural numbers from 1 to given number using the function in Python language

Program to the sum of Natural number – using the recursion

Program 4

#Python program to find sum of natural numbers 1 to givrn number
def sum_NumRec(num):#recursive function definition
  if(num==0):
      return num
  else:
      return(num+sum_NumRec(num-1))
number=input("Enter a positive number to calculate sum: ")
number=int(number)
sum= sum_NumRec(number)#function call

print("Sum of Natural numbers from 1 to {0}={1}".format(number,sum))

When the above code is executed it produces the following output

Enter a positive number to calculate sum: 100
Sum of Natural numbers from 1 to 100=5050

This program allows the user to enter a maximum number. and it displays the addition of natural numbers from 1 to given number using the recursive function in Python language

 

Suggested for you

for loop in Python

while loop in python

if statements in Python

function in Python

recursion of Python

 

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