How to allow user input to exit the program?

[jaywalls]

I need to create a command where the user inputs a character and it'll exit out the program rather than executing any of the other code.

For example :

If I wanted to do like

char key;

if (key == D || key == d)
{


}



What would I need to put in between those brackets under the if statement to allow the user to enter the letter D and it would close out the program?

[Smac89]

getch()

http://www.programmingsimplified.com/c/conio.h/getch

[jaywalls]

Thanks!