Help setting an output pin high.

#include <system.h>
#include <pic16F88.h> //Pic Chip being used

void main() //start of main function
{

volatile bit RA1 @ PORTA.1; //declare port bits
volatile bit RA4 @ PORTA.4;
volatile bit RB4 @ PORTB.4;

trisa=10010b; //set RA4 and RA1 as inputs
trisb=0b; //set RB4 as outputs
portb=0; //initialise Portb
osccon=0x7E; //internal 8Mhz clock

cmcon=00000010b; //configure comparators 010,
cvrcon=11000100b; //set reference voltage of 2.88 volts


delay_s(10); //create 10 second delay
while(1) //infinite loop
{
RB4=cmcon.7; //assign the comparison result to RB4
if (cmcon.7==0 && RA4==1) //if comparison is low but switch at RA4 is pressed set RB4 high for 10 seconds
{
RB4=1;
delay_s(10);
}
} //end of while loop
} //end of main

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