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本帖最后由 BaysideLizard 于 2023-11-14 22:21 编辑
- #include <stdio.h>
- //DNX写于2023年10月5日
-
- int main()
- {
- char a ='Z';
- int b = 123;
- char *pa = &a;
- int *pb = &b;
- printf("a = %c\n",*pa);
- printf("b = %d\n",*pb);
-
- //通过指针间接访问数据
- *pa = 'H';
- *pb += 1;
- printf("Now,a = %c\n",*pa);
- printf("Now,b = %d\n\n",*pb);
-
- //Dev C++中指针变量的大小都是8字节
- printf("Sizeof a = %d,sizeof pa =%d\n",sizeof(a),sizeof(pa));
- printf("Sizeof b = %d,sizeof pb =%d\n\n",sizeof(b),sizeof(pb));
- //不加取值运算符,则输出指针的值,用%p打印地址类型
- printf("The address of pa is %p\n",pa);
- printf("The address of pb is %p\n",pb);
- /*避免访问未初始化的指针
- eg. int *m; 未初始化的指针
- *m = 123; 此操作非常危险
- */
-
- return 0;
- }
复制代码
运行结果:
a = Z
b = 123
Now,a = H
Now,b = 124
Sizeof a = 1,sizeof pa =8
Sizeof b = 4,sizeof pb =8
The address of pa is 000000000062FE0F
The address of pb is 000000000062FE08
--------------------------------
Process exited after 0.03476 seconds with return value 0
请按任意键继续. . .
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