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## Sum of first n integers in Python

Given the value of an integer n, how to calculate the sum of first n integers using Python.

## ## Calculate the sum of first n integers # Get input from user n = int(input("Enter the value of n: ")) # Calculating the sum upto the provided number summation = ( n * (n + 1) ) / 2 # Outputting the value on to the screen print("Sum of first", str(n), "integers is:", int(summation)) ## INPUT: 5 OUTPUT: 15 ## summation variable becomes a float when there is a dividing operation in the expression. That is why, we cast the value of summation to an int in the print statement. ##

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