Write a C++ program that prompts the user to input an integer (n) and outputs the sum of all integers i from 1 ton, but if = 2 is an integer) then I will have a negative sign. For example, for n = 8 the sum is equal to -1-2+3-4+5+6+7 -8= 6, because 1, 2.4 and 8 are 2.2.2 and 2 respectively while 3, 5,6, and 7 are not equal to z for any integer). Note: Solve this question without defining any other function apart from the main function