how to assign the port as an input port

for using keil cx51 version
how to assign the port as an input port

for using keil cx51 version
Port input ouput

How can i read a port in 8051 uC. Can you please list out a source which accept P0 port value and add 10 into it and write it to P2. ( please include all variable declaration in soyrce code).
Port input ouput

How can i read a port in 8051 uC. Can you please list out a source which accept P0 port value and add 10 into it and write it to P2. ( please include all variable declaration in soyrce code).
input through serial port

I need some help regarding how to give input through serial port. I can see the output of serial port in UART #1. char rxcharacter(void) { char character; SBUF = _getkey (); //SBUF = 'G';...