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Exercise P6.2. Write a function that computes the alternating sum of all elements in a vector. For example, if alternating_sum is called with a vector containing 1 4 9 16 9 7 4 9 11 then it computes 1-4+9-16+9-7+4-9+11=-2 Problem P6.2. Implement a function discussed in Problem 6.2 that computes the alternate sum of element:s of a vector. Write a program that prompts the user to enter a list of integers and then use the above function to compute the alternate sum and display it (see the input-output sample for details) Implement a loop in which the above actions are repeated until the user requests to quit. . You can assume that the list of integers is nonempty. Remark: To enter a list of integers contiguously (see the sample of input-output), you must check if a character, which follows a number that has been read by cin, is a space newline character or any other character. In the latter case, put the character back in the buffer using cin.unget (). . Submit the solution as hmw.5.1.cpp. Sample input-output