Switch Input Code Help

while(1){
          temp= 0b00001111 & PORTA;
          temp = temp ^ 0b00001111;
          if(temp>0){             // new key found
          Key_Scan();		  // do action on each switch
          Update_LCD();          // if new key found update the display
     }
  }

#define      sw1      !PORTAbits.RA0
#define      sw2      !PORTAbits.RA1
#define      sw3      !PORTAbits.RA2
#define      sw4      !PORTAbits.RA3

while(1){
      if(sw1){
            // do action for switch number 1
      }
      if(sw2){
            // do action for switch number 2
      }
      if(sw3){
            // do action for switch number 3
      }
      if(sw4){
            // do action for switch number 4
      }
      
      UpdateLCD();
}