How to type en-dash and em-dash in Windows 7/8?

If you have a numpad, turn numlock on and use Alt + 0150 for en-dash and Alt + 0151 for em-dash. That is keep Alt pressed and type the numbers on the numeric keypad.

EDIT: As @gronostaj points out, this works with only left Alt.

For anyone looking for a slightly faster (although not-native) solution, I have made an AutoHotKey program that lets you type Em and En dashes somewhat naturally. I really made it for myself, but it's on Github if anyone's interested.

It's called Em-n-en.

The entire point of this program is to allow a user to quickly insert an em/en dash by typing ==- (Em dash) or --= (En dash). There are other methods for inserting the dashes - these are covered in the program itself. Note that this only works on windows.

Hopefully this is helpful! :)