How can we write a C++ program using sentinel

Problem 3: Number Classification s ending with -999. The program should count and print how many numbers are in the following intervals [0, 100), [100, 1000) and greater than 1000. If the number is negative and other than -999 then it should be ignored. Sample input / output: Enter a nunber. -999 to stop: 1200 320 -146 87 516 845 1750 25 212 67-999 here are 4 numbers in the interval [100. 1000 here are 2 numbers greater than 1808