Help! Trying to set up if statement for inut pin

#include <stdio.h> /* standard I/O .h-file */
#include <reg167.h> /* special function register 80C167 */


/****************/
/* main program */
/****************/
void main (void) { /* execution starts here */
/* initialize the serial interface */
#ifndef MCB167 /* do not initialize if you use Monitor-166 */
P3 |= 0x0400; /* SET PORT 3.10 OUTPUT LATCH (TXD) */
DP3 |= 0x0400; /* SET PORT 3.10 DIRECTION CONTROL (TXD OUTPUT) */
DP3 &= 0xF7FF; /* RESET PORT 3.11 DIRECTION CONTROL (RXD INPUT) */
S0TIC = 0x80; /* SET TRANSMIT INTERRUPT FLAG */
S0RIC = 0x00; /* DELETE RECEIVE INTERRUPT FLAG */
S0BG = 0x40; /* SET BAUDRATE TO 9600 BAUD */
S0CON = 0x8011; /* SET SERIAL MODE */
#endif
//
if (Pin2 =1);
printf ("AT command\n"); /* the 'printf' function call */
while (1) { /* An embedded program does not stop and */
; /* ... */ /* never returns. We've used an endless */
} /* loop. You may wish to put in your own */
} /* code were we've printed the dots (...). */

This is an example programme modified. I am trying to see if an alert has been set high at input then output command to serial port(GSM module). I am no good at C. Thanks

#include <stdio.h> /* standard I/O .h-file */
#include <reg167.h> /* special function register 80C167 */


/****************/
/* main program */
/****************/
void main (void) { /* execution starts here */
/* initialize the serial interface */
#ifndef MCB167 /* do not initialize if you use Monitor-166 */
P3 |= 0x0400; /* SET PORT 3.10 OUTPUT LATCH (TXD) */
DP3 |= 0x0400; /* SET PORT 3.10 DIRECTION CONTROL (TXD OUTPUT) */
DP3 &= 0xF7FF; /* RESET PORT 3.11 DIRECTION CONTROL (RXD INPUT) */
S0TIC = 0x80; /* SET TRANSMIT INTERRUPT FLAG */
S0RIC = 0x00; /* DELETE RECEIVE INTERRUPT FLAG */
S0BG = 0x40; /* SET BAUDRATE TO 9600 BAUD */
S0CON = 0x8011; /* SET SERIAL MODE */
#endif
//
if (Pin2 =1);
printf ("AT command\n"); /* the 'printf' function call */
while (1) { /* An embedded program does not stop and */
; /* ... */ /* never returns. We've used an endless */
} /* loop. You may wish to put in your own */
} /* code were we've printed the dots (...). */

This is an example programme modified. I am trying to see if an alert has been set high at input then output command to serial port(GSM module). I am no good at C. Thanks

Well, I'm not sure which pin you're after, but if you wanted to check the status of, say, pin 5 of port 3, the you'd write something like this:

if ( ( P3 & (1 << 5) ) == 1 )
    /* do something here */;

/* declare special bit */
sbit my_pin = P3 ^ 5;
...
if ( py_pin == 1 )
    /* do something here */;

Thanks very much. Have a better idea of where i heading now. Much appreciated.

Sorry, I meant

if ( ( P3 & (1 << 5) ) != 0 )

if ( ( P3 & (1 << 5) ) == 1 )