標(biāo)題: 超簡單的IEEE754toFlaot數(shù)據(jù)類型轉(zhuǎn)換 [打印本頁]

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作者: sun_qian    時間: 2017-10-20 22:56
標(biāo)題: 超簡單的IEEE754toFlaot數(shù)據(jù)類型轉(zhuǎn)換
/*  HELLO.C -- Hello, world */

#include "stdio.h"
#include "conio.h"

char test1[4]={0x3f,0x99,0x99,0x9a} ;
char test2[4]={0x3f,0x99,0x99,0x9a} ;
char Buffer[4]={0x0};
union packet
{
  float a;
  char  b[4];
};

float IEEE754_to_Float(char *p)
{
   char i;
   char tmp;
   union packet q;

   tmp=*p;
   *p=*(p+3);
   *(p+3)=tmp;
   tmp=*(p+1);
   *(p+1)=*(p+2);
   *(p+2) =tmp;

   for (i=0;i<4;i++)
   q.b[i]=p[i];

   return q.a;

}

void Float_to_IEEE754(float x)
{
   char i;

   union packet p;

   p.a=x;
   for(i=0;i<4;i++)
   {
    Buffer[3-i]=p.b[i];
   }

}



main()
{

    Float_to_IEEE754(IEEE754_to_Float(test1));
    printf("Hello, world\n");
    printf("%x\n",Buffer[0]);
    printf("%x\n",Buffer[1]);
    printf("%x\n",Buffer[2]);
    printf("%x\n",Buffer[3]);

       printf("%x\n",test1[0]);
       printf("%x\n",test1[1]);
       printf("%x\n",test1[2]);
       printf("%x\n",test1[3]);


    printf("%f",IEEE754_to_Float(Buffer));
    getch();
}

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