how do you convert keil c source code to hex file. othr than f7 button....
One way would be to use a text editor.
Slow and awkward; but possible.
Would you like to elaborate?
Other than F7, there is a toolbar button, and a menu item - see: http://www.keil.com/support/man/docs/uv4/uv4_ui_project.htm
See also: http://www.keil.com/support/man/docs/uv4/uv4_ex_hello.htm