2.反思

9月27

练习2

1.sizeof( ？)求字节\\例：printf("sdasdad",sizeof(?));

#include<stdio.h>

using namespace std;

int main()

{

printf ("The size of short is %d bytes.\n",sizeof(short));

printf ("The size of int is %d bytes.\n",sizeof(int));

printf ("The size of long is %d bytes.\n",sizeof(long));

printf ("The size of long long is %d bytes.\n",sizeof(long long));

return 0;

}

2.#控制前导显示\\例：printf("%#o",a);

3.%o:16进制 %X:8进制

4.输出整数：printf("%d",0xABCD); 问：为什么这里用0数字而不是o字母？

5.字符用cahr printf 用%c