Cursed sizeof.

sizeofplusplus.c

#include <stdio.h>

#define sizeof(x) (!(#x[0]^0x27)?:sizeof(x))

#define q(x) printf("%-7s\t%zu\n", #x, x)
#define p(x) q(sizeof(x))

int main (void)
{
	char s[7], c;
	int i;

	p(s);
	p(c);
	p(i);
	p('x');
}