Total Sum in Range

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Unit 1 Session 1 (Click for link to problem statements)

U-nderstand

Understand what the interviewer is asking for by using test cases and questions about the problem.

• Will start and stop always be positive integers?
  • Yes.
• Will start ever be larger than stop?
  • No.

P-lan

Plan the solution with appropriate visualizations and pseudocode.

General Idea: Create a function that takes parameters start to stop and returns the sum of the numbers from start to stop.

1) Create a variable to store the total sum
2) Loop through the numbers "start" to "stop", and add each to the sum variable
3) Return the sum variable

⚠️ Common Mistakes

• Make sure your loop includes the first number and the final number!

I-mplement

def sum_range(start, stop):
	total = 0
	for num in range (start, stop + 1):
		total += num
	return total