Radon is a gas that occurs naturally from the breakdownâor the radioactive decayâof uranium. Rocks, soil, and in some cases groundwater can all contain uranium.Because radon comes from so many sources, people are easily exposed to it.adon is an odorless, colorless, radioactive gas. It is also the second leading cause of lung cancer in the United States.
File Menu in MS Excel: File menu is the first menu in the MS Excel menu bar. It functions the file management and importing from external sources to MS Excel. The File menu allows one to open, save, close, print and so on in MS Excel. It gives the users options to save the workbook, open new workbook and so on.
1 To prevent the command window from closing as soon as the program finishes execution, add the following line to the end of your main function: 2  getchar(); 3  This library function waits for any input key, and will therefore keep your console window open until a key is pressed.