C const

const.c

// This is a slight modification of the original at:
//   http://www.cap-lore.com/Languages/const.c
//
// Does "int const *" refer to a constant pointer, or a constant integer?
// The following shows what gcc thinks.
// gcc 4 rejects any of the lines below that are commented out.
typedef const int * cip;
typedef int const * icp;
typedef int * const ipc;
typedef int const * const icpc;

  int xx(const int x){return x+3;}
//int xy(const int x){return (++x)+3;}
//int xy(int const x){return (++x)+3;}

  int xcipa(cip x){return *x+3;}
  int xcipb(cip x){return *(++x)+3;}
//int xcipc(cip x){return ++(*x)+3;}

  int xicpa(icp x){return *x+3;}
  int xicpb(icp x){return *(++x)+3;}
//int xicpc(icp x){return ++(*x)+3;}

  int xipca(ipc x){return *x+3;}
//int xipcb(ipc x){return *(++x)+3;}
  int xipcc(ipc x){return ++(*x)+3;}

  int xicpca(icpc x){return *x+3;}
//   int xicpcb(icpc x){return *(++x)+3;}
//   int xicpcc(icpc x){return ++(*x)+3;}

// Thus 'const' refers to the thing on its left, if any.
// Otherwise on its right.