C語言中sizeof()求字節數的應用舉例

本文盡可能多的測試了在Win32平台下用sizeof()求各種類型變量字節數的結果，而且會不斷更新。很有參考價值哦！

sizeof(char)=1
sizeof(short)=2
sizeof(int)=4
sizeof(long)=4
sizeof(float)=4
sizeof(double)=8
sizeof(long double)=8

sizeof(unsigned char)=1
sizeof(unsigned short)=2
sizeof(unsigned int)=4
sizeof(unsigned long)=4
sizeof(unsigned float)=4
sizeof(unsigned double)=4
sizeof(unsigned long double)=8

char a[] = {'a','b','c','d','e'};//sizeof(a)=5
char b[] = "abcde";//sizeof(b)=6
char c[][3] = {{'a','b','c'},{'d','e','f'},{'g','h','i'},{'j','k','l'}};
//sizeof(c)=12
//sizeof(c[0])=3
//sizeof(c[0][0])=1
char d[][5] = {"abcc","deff","ghii","jkll"};
//sizeof(d)=20
//sizeof(d[0])=5
//sizeof(d[0][0])=1
char *p = 0;//sizeof(p)=4
char *q = (char *)malloc(5);//sizeof(q)=4
char *r = "abcde";//sizeof(r)=4
char (*f)(void) = NULL;//sizeof(f)=4

char *s1[3] = {"aa","bb","cc"};
//sizeof(s1)=12
//sizeof(s1[0])=4
//sizeof(*s1[0])=1

char *s2[3][3] = {{"aa","bb","cc"},{"aa","bb","cc"},{"aa","bb","cc"}};
//sizeof(s2)=36
//sizeof(s2[0])=12
//sizeof(*s2[0])=4

char h[3][3] = {{1,2,3},{4,5,6},{7,8,9}};
char (*ph)[3] = h;
//sizeof(ph)=4
//sizeof(*ph)=3
//sizeof(ph[0])=3
//sizeof(*ph[0])=1

C++ Primer Plus 第6版 中文版 清晰有書簽PDF+源代碼 http://www.linuxidc.com/Linux/2014-05/101227.htm

讀C++ Primer 之構造函數陷阱 http://www.linuxidc.com/Linux/2011-08/40176.htm

讀C++ Primer 之智能指針 http://www.linuxidc.com/Linux/2011-08/40177.htm

讀C++ Primer 之句柄類 http://www.linuxidc.com/Linux/2011-08/40175.htm

將C語言梳理一下，分布在以下10個章節中：

1. Linux-C成長之路（一）：Linux下C編程概要 http://www.linuxidc.com/Linux/2014-05/101242.htm
2. Linux-C成長之路（二）：基本數據類型 http://www.linuxidc.com/Linux/2014-05/101242p2.htm
3. Linux-C成長之路（三）：基本IO函數操作 http://www.linuxidc.com/Linux/2014-05/101242p3.htm
4. Linux-C成長之路（四）：運算符 http://www.linuxidc.com/Linux/2014-05/101242p4.htm
5. Linux-C成長之路（五）：控制流 http://www.linuxidc.com/Linux/2014-05/101242p5.htm
6. Linux-C成長之路（六）：函數要義 http://www.linuxidc.com/Linux/2014-05/101242p6.htm
7. Linux-C成長之路（七）：數組與指針 http://www.linuxidc.com/Linux/2014-05/101242p7.htm
8. Linux-C成長之路（八）：存儲類，動態內存 http://www.linuxidc.com/Linux/2014-05/101242p8.htm
9. Linux-C成長之路（九）：復合數據類型 http://www.linuxidc.com/Linux/2014-05/101242p9.htm
10. Linux-C成長之路（十）：其他高級議題