use c++

Refer to the Figure 4 below. cin > input; do \& cin input; sum += input; counter++; \} while (input != SENTINEL); Figure 4: C++ Program Segments Given the SENTINEL =123, counter =0 and sum =0. (a) Determine the output based on the Figure 4 if the input for the input is 10 20603011123. Provide the tracing table to show the steps. (10 marks) (b) Do you identify any issue(s) with this program? If yes, explain the issue(s). (5 marks) (c) Based on your answer in 3 (b), rewrite the correct program to get the correct result. (10 marks) 25 marks