浮点数和机器码

1.浮点数到机器码：

#include <iostream>
using namespace std;
 
int main(){
    float a=0.5;
    float b=27.5;
    float c=-12.5;
 
    unsigned int* pa=NULL; //定义一个指针
    pa=(unsigned int*)&a;  //让pa指向a
    unsigned int* pb=NULL;
    pb=(unsigned int*)&b;
    unsigned int* pc=NULL;
    pc=(unsigned int*)&c;
 
    cout<<hex<<"a=0x"<<*pa<<endl; //输出pa的值
    cout<<hex<<"b=0x"<<*pb<<endl;
    cout<<hex<<"c=0x"<<*pc<<endl;
 
    return 0;
}

输出结果：

a=0x3f000000
b=0x41dc0000
c=0xc1480000

2.机器码到浮点数

#include <iostream>
using namespace std;
 
int main(){
    unsigned int hex=0x41360000;
    float* fp=(float*)&hex;
    cout<<"x="<<*fp<<endl;
    return 0;
}

输出结果：

x=11.375