Write a MATLAB program to evaluate the function
$$
y(x)=\ln \frac{1}{1-x}
$$
for any user-specified value of $x$, where In is the natural logarithm (logarithm to the base e). Write the program with a while loop, so that the program repeats the calculation for each legal value of $x$ entered into the program. When an illegal value of $x$ is entered, terminate the program. (Any $x \geq 1$ is considered an illegal value.)