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Summing Port 0 and Port 1 with C Programming

/************************************
           **
           ** A program to get familer with SDCC
           **
           ** This program will read port 0 and port 1
           ** and will add the their contents. Then it checks
           ** whether the result is greater than 127 or not. If it is
           ** greater than 127 then the addition result would be
           ** put to port 3 else to port 2. 
           ** Compiler : MIDE-51
*************************************/

#include <8051.h>

void main(void)
           {
           unsigned char a, b, c;

 a=P0;
           b=P1;
           c=a+b;

 if (c<127)
           P2=c;
           else
           P3=c;

 return;
           }

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