text: #include <stdio.h>
  char carray[]="HelloWorld!";
  int iarray[]={0,1,2,3,4,5,6,7,8,9,10};
  double darray[]={0.0,1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0};
  int main()
  {
      char *pc=carray;
      int *pi=iarray;
      double *pd=darray,*ppd;
      printf("before ++ pc=%p pi=%p pd=%p \n",pc,pi,pd);
      pc++;pi++;pd++;
      printf("after ++ pc=%p pi=%p pd=%p \n",pc,pi,pd);
      pc+=5;pi+=5;pd+=5;
      printf("bafter +=5 pc=%p pi=%p pd=%p \n",pc,pi,pd);
      ppd=&darray[5];
      if (ppd>pd)
          printf("ppd>pd\n");
      else
          printf("ppd<=pd\n");
      return 0;
  }
  