C code for 16F877A microcontroller

Hi can anyone provide me a simple code in C for 16F877A microcontroller?
The operation is when pin A0 or pin A1 has 5V input it will produce 5v output at pin B5. I have rs232 cable connected to pin C6(Xmit) and C7(rcv). When pin A0 or pin A1 has an input of 5V, it will PRINTF("ATD0123423539;\n\r"); where my phone which is attached to the rs232 cable will call the destination number. Hope anyone here call help me out.Thanks.

 

It should be in your compiler. You need to hook up the uC to a modem and then run the code.