please help me how to convert c file to hex file in keil c micro version ...........
and where the converted hex file is saved and also help me how to add that hex file to 89c51 microcontroller in proteus labcentre............... if possible please give me simple proteus circuit with keil c program for 89c51

 

In the project windows, right-click "target". Select the "output" tab. Tick "create hex file". Then compile your program.