Macro exercise

Hello,

I want to use a macro for a structure member, something
like:


typedef struct {
  int a;
  int b;
  int c;
} myStruct;

myStruct x;

x.a = 7;
x.b = 8;
x.c = 9;

#undef PARAM
#define PARAM a
printf("x=%d\n", x.##PARAM);

#undef PARAM
#define PARAM b
printf("x=%d\n", x.##PARAM);

#undef PARAM
#define PARAM c
printf("x=%d\n", x.##PARAM);


But I'm having problems in writing it correct (that
"x.##PARAM"). Are you
faster than a google search? 

Thanks



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