超簡單的IEEE754toFlaot數(shù)據(jù)類型轉(zhuǎn)換

ID:241449 · 發(fā)表于 2017-10-20 22:56

/*  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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