#include<iostream>
using namespace std;

int main()
{
cout << "Hello World!" << endl;
float a = 100.0;
printf("%x\n",&a);
printf("%x\n",(int*)&a);
printf("%x\n",*(int*)&a);
int *b = (int *)&a;
printf("%x\n",*b);//42c80000

return 0;
}
//8位1字节 1位=“1个二进制” 4位=“一个十六进制”
//int*拿32位，char*拿8位