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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

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