$16\mathrm{.}2$ Write a C program that accepts a list of numbers from the user until a

number is repeated $($i$.$e$.,$ is the same as the number preceding it$).$ The

program then prints out the number of numbers entered $($excluding the

last$)$ and their sum. When the program is run, the prompts and

responses will look like the following:

Number: $5$

Number: $-6$

Number: $0$

Number: $45$

Number: $45$

$4$ numbers were entered and their sum is $44$