常见数据类型的字节数

int main()
{
	int a = sizeof( unsigned char );		//1
	int b = sizeof( char );					//1
	int c = sizeof( unsigned int );			//4
	int d = sizeof( int );					//4
	int e = sizeof( short );				//2

	unsigned char f = ' ';

	unsigned char s[100]="1234567";
	const char *str = "1234567";

	int g = sizeof(s);						//100
	int h = strlen((char*)s);				//7
	int i = sizeof(s);						//100
	int j = sizeof(str);					//4
	int k = strlen(str);					//7

	int l = 1024*1024*1024*2-1;
	unsigned long long m = 1024*1024*1024*1024ull;	//必须加当等式右边数字大于 2^31-1 等式右边其中一个数必须加ull ，不然会溢出

	int	arr1[10]={0};
	int arr2[10] = { 1,2,3,4,5,6,7,8,9,10 };
	memcpy( arr1,arr2,sizeof(int)*9 );		//比较方便的数组赋值方法
}

WIN32 
unsigned short : 2
long           : 4
unsigned long  : 4
unsigned char  : 1
char           : 1
unsigned int   : 4
short          : 2
LINUX_64 
unsigned short : 2
long           : 8
unsigned long  : 8
unsigned char  : 1
char           : 1
unsigned int   : 4
short          : 2