C++ but no #include functions

Program 4: 5 points> sqrt-Step2.cpp We are going to make a series of programs that will lead to calculation of the square root of an integer number. As part of this assignment, we are going to make a small piece that will go inside a big program later. Think about the square root of 10. The square root of 10 is between 3 and 4. The user will enter those three numbers (e.g. num(10, top (4) and bottom (3)). Between top and bottom, which number is closer to the square root of num? If num is a perfect square, top has the square root of num. See the example for the square root of 16 on the next page You may NOT use sqrt(num) (the square root function) in cmath.h. You are preparing to create this function from scratch Test your program using the following 4 test cases