Python program to find sum of n numbers; In this tutorial, you will learn how to find or calculate sum of n numbers using for loop, while loop and function.
Python Program to Calculate Sum of n Numbers
- Calculate/Find the sum of n natural numbers using loop and range function.
- Find/Calculate Sum of n natural numbers in python using while loop
- Python program to find/calculate the sum of numbers in a given list
- The mathematical formula to find/calculate the sum of n numbers with python program
- Python Program to Find/Calculate sum of n odd natural numbers.
- Python Program to Find/Calculate sum of n even natural numbers.
1: Find/Calculate the sum of n natural numbers using loop and range function
- First of all, you can use a python input() function in your python program that takes a user to enter the number (n) to calculate the sum.
- Next, declare a variable that name sum, it will contain sum of n natural numbers sum.
- Next, run loop till the entered number using the for loop and range() function.
- Inside a loop, calculate the sum of n numbers using a
sum = sum + current numberformula. - After the loop ends, print the sum variable that contains the sum of n numbers
n = input("Enter Number to calculate sum")
n = int (n)
sum = 0
for num in range(0, n+1, 1):
sum = sum+num
print("SUM of first ", n, "numbers is: ", sum )
Output:
Enter Number to calculate sum 5 Sum of first 5 number is: 15
2: Find/Calculate Sum of n natural numbers in python using while loop
Also, use the while loop in python to calculate the sum of n numbers.
- First of all, you can use a python input() function in your python program that takes a user to enter the number (n) to calculate the sum.
- Next, declare a variable that name sum, it will contain the sum of n natural numbers sum.
- Run while loop until n is greater than zero
- Add the current value of n to sum variable. And, decrement n number by 1 in while loop body
- After the loop finishes, the print sum name variable.
Python program to find the sum of n numbers using While loop:
n = input("Enter Number to calculate sum")
n = int (n)
total_numbers = n
sum=0
while (n >= 0):
sum += n
n-=1
print ("sum using while loop ", sum)
Output:
Enter Number to calculate sum 5 Sum using while loop 15
3: Python program to Find/Calculate the sum of numbers in a given list
- Declare a variable that name sum, it will contain the sum of n natural numbers sum.
- Next, define list and assign a value to a python list.
- Run for a loop and Add the current value of n to sum variable.
- After the loop finishes, the print sum name variable.
sum = 0
list = [11,4,5,7,99,10,12]
for num in list:
sum = sum +num
print ("sum of list element is : ", sum)
Output:
sum of list element is : 148
4: The mathematical formula to Find/Calculate the sum of n numbers with python program
In the above programs, you have learned how to calculate the sum of n numbers using for loop, while loop and range function.
Now, you will learn how to calculate/find sum of n numbers in python without for loop, while loop in python. Calculate the sum directly using a mathematical formula in python program.
The sum of the n natural number mathematical formula is = n * (n+1) / 2.
In the below python program, you will learn how to use this mathematical formula is = n * (n+1) / 2 to find/calculate sum of n numbers in python programs.
Follow the steps:
- Take a input from user in your python program using input() function.
- Convert a user inputted number to an integer using int() function.
- Calculates sum of number by using this formula
n * (n+1) / 2in your python program. - After that, the print name sum variable.
n = input("Enter a number to calculate sum")
n = int (n)
sum = n * (n+1) / 2
print("Sum of fthe irst ", n, "natural numbers using formula is: ", sum )
Output:
Enter a number to calculate sum 5 Sum of fthe irst 5 natural numbers using formula is: 15.0
5: Python Program to Find/Calculate sum of n odd natural numbers
- Take input from user using python input() function in your python program.
- Next, declare a variable that name sum, it will contain the sum of n odd numbers.
- Next, run loop till the entered number using the for loop and range() function.
- Inside a loop, calculate the sum of n odd numbers using a
sum = sum + current numberformula with (not (num % 2) == 0). - After the loop ends, print the sum variable that contains the sum of n odd numbers.
Python program to find sum of n odd numbers:
n = input("Enter Number to calculate sum")
n = int (n)
sum = 0
for num in range(0, n+1, 1):
if(not (num % 2) == 0):
sum += num;
print("SUM of odd numbers is: ", sum )
Output:
Enter Number to calculate sum 5 SUM of odd numbers is: 9
6: Python Program to Find/Calculate sum of n even natural numbers
- Take input from the user using python input() function in your python program.
- Next, declare a variable that name sum, it will contain the sum of n even numbers.
- Next, run loop till the entered number using the for loop and range() function.
- Inside a loop, calculate the sum of n even numbers using a
sum = sum + current numberformula with if test condition ((num % 2) == 0). - After the loop ends, print the sum variable that contains the sum of n even numbers.
Python program to find sum of n even numbers:
n = input("Enter Number to calculate sum")
n = int (n)
sum = 0
for num in range(0, n+1, 1):
if((num % 2) == 0):
sum += num;
print("SUM of even numbers is: ", sum )
Output:
Enter Number to calculate sum 5 SUM of even numbers is: 9
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