Please write the code in C++ code by code. I'm having a hard time understanding it all so please write the full code for both of the problems and make it simple as possible. Thank you, much appreciated.

PROGRAMMING EXERCISES P3.1 Write a program that reads a temperature value and the letter C for Celsius or F for Fahrenheit. Print whether water is liquid, solid, or gaseous at the given temperature at sea level. Programming Exercises 119 P3.2 The boiling point of water drops by about one degree centigrade for every 300 meters (or 1,000 feet) of altitude. Improve the program of Exercise P3.1 to allow the user to supply the altitude in meters or feet