When the first time I use Visual 2012 to run my "Hello world" program by clicking the "local window debugger", I did not see the run window. I googled it , and found two soultions:
1. use getchar();
These will  put a pause at the end of the application and allow you to see what you have without switching off debugging for an application.
2. use ctrl+F5 instead F5 to run the program.