Question

a) Write a program that prompts for an integer—let’s call it X—and then finds the sum of X consecutive integers starting at 1. That is, if X=5, you will find the sum of 1+2+3+4+5=15.b) Modify your program by enclosing your loop in another loop so that you can find consecutive sums. For example , if 5 is entered, you will find five sum of consecutive numbers:1 = 11+2 = 31+2+3 =61+2+3+4 =101+2+3+4+5 =15Print only each sum, not the arithmetic expression.

Answer 1

Answer:

Solution a

1. n = int(input("Enter an integer: "))
3. sum = 0
5. for x in range(1, n+1):
6.    sum += x  
8. print(sum)

Solution b

1. n = int(input("Enter an integer: "))
3. for a in range(1, n + 1):
4.    sum = 0
5.    for x in range(1, a+1):
6.        sum += x
7.    print(sum)

Explanation:

Solution code is written in Python 3.

Solution a

First get the user input for an integer (Line 1).

Create a variable sum and initialize it with zero value (Line 3).

Create a for loop to traverse through the number from 1 to integer n (inclusive) and sum up the current number x (Line 5-6).

Print the sum to terminal (Line 8).

Solution b

Create an outer for loop that traverse through the number from 1 to integer n (inclusive) (Line 3).

Create an inner loop that traverse through the number from 1 to current a value from the outer loop and sum up the current x value (Line 5-6).

Print the sum to terminal (Line 7) and proceed to next iteration and reset the sum to zero (Line 4).

Answer 2

The program that prompts for an integer—let’s call it X—and then finds the sum of X consecutive integers starting at 1 is represented as follows:

x = int(input("please input an integer: "))

all_numbers = []

for i in range(1, x+1):

  all_numbers.append(i)

print(sum(all_numbers))

The first line of code ask the user for an integer input.

The second line of code is a variable named all_numbers initialised with an empty list.

Then we loop through the range number 1 to the inputted integer plus one.

Then append the looped value to the empty array.

Finally, we print the sum of the already filled array.

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