i need help with part b & c in c++. please and thank you. im having trouble finding largest and middle number of a set of 3 numbers.

In this assignment, you will create a very particular calculator that works with 3 integer numbers at a time rather than the usual 2 in regular calculators. The calculator is also particular in that the desired operation is provided ahead of the numbers: 1. So, first, ask the user to enter the desired operation (use cin) and store the value in a variable named operation. The user input will consist of a single letter or symbol. Entering: a) 'a' or 'A' gives the average (shown as a fractional number) b) 'M' gives the largest number c) 'c' or 'C' gives the middle number