資料結構

#include <stdio.h>
#include <stdlib.h>
int main(void){
  int a=1;
  double b=2.0;
  char c='A';

  int* ptr1;
  double* ptr2;
  char* ptr3;

  ptr1=&a;
  ptr2=&b;
  ptr3=&c;

  printf("sizeof(a)%d\n",sizeof(a));
  printf("sizeof(b)%d\n",sizeof(b));
  printf("sizeof(c)%d\n",sizeof(c));

  printf("\n====================================\n");

  printf("address of a %p\n",&a);
  printf("address of b %p\n",&b);
  printf("address of c %p\n",&c);

  printf("\n====================================\n");

  printf("the value of ptr1 %p\n",ptr1);
  printf("the value of ptr2 %p\n",ptr2);
  printf("the value of ptr3 %p\n",ptr3);

  printf("\n====================================\n");

  printf("the value of a %d\n",*ptr1);
  printf("the value of b %.2f\n",*ptr2);
  printf("the value of c %c\n",*ptr3);

  system("PAUSE");
  return 0;
}