C++: Need help to make a program that returns gas temp in Celsius.

The electric circuit shown below is designed to measure the temperature of the gas in a chamber Rs = 75 11.43 V Voltmeter o The resistor R represents a temperature sensor enclosed in the chamber. The resistance R, in , is related to the temperature T, in C, by the equation In this device, assume Ro-100 and k-05. The voltmeter displays the value of the voltage, Vm , across the sensor. This voltage Vm indicates the temperature, T, of the gas according to the equation Suppose the voltmeter voltage is constrained to the range Vmin 12 volts s VmE Vmax 18 volts. Write a program that accepts a value of Vmand checks that it's between 12 and 18. The program should return the gas temperature in degrees Celsius when V is between 12 and 18 and an error message when it isn't