一个指针变量到底占几个字节

#include <stdio.h>

int main (void)

{

int *p;

double *q;

char *t;

int a = 1;

double b = 2.5;

char c = 'd';

p= &a;

q = &b;

t = &c;

/*sizeof (变量名) 返回变量所占的字节数*/

printf ("p = %d , q = %d , t = %d ,\n" , sizeof p , sizeof q, sizeof t);

printf (" a = %d , b = %.3lf, c = %c. \n " , *p , *q, *t);

return 0;

}