I need help with this C++ assignment.

Create a program which will implement the sum of the numbers between 1 and n where n is an integer. When completed, the program will allow the user to input a positive integer (n) then the program will add all numbers between 1 and n (including n) and output the sum. For example, if the user enters 8 then the program will sum the numbers 1 through 8 and will output the sum.

Test your program with the following inputs:

a. 8 (sum is 36)

b. 75 (sum is 2850)

c. 100 (sum is 5050)