4字节单精度浮点型十六进制转浮点型十进制数据源码
//------------------------------------------------------------------------------------------------------------------------------------------//
windows ----GPS
#include <stdio.h>
//联合fnum存储数据
union fnum
{
int m;
float f;
};
int main(int argc, char *argv[])
{
union fnum num;
num.m=0x40a80000;//十六进制数赋值给整数
printf("十六进制输出int：0x%x\n",num.m);//输出0x40a80000
printf("十进制输出float：%f\n",num.f);//输出5.250000
return 0;
}
//-------------------------------------------------------------------------------------------------------------------------------------//
#include <stdio.h>
int main()
{
long int n; //Tc3.0ºÃÏñÊÇ16λ±àÒëÆ÷
printf("ÊäÈë8λ16œøÖÆÊý£º");
scanf("%x",&n);
printf("%f\n",*((float*)&n));
return 0;
}
//--------------------------------------------------------------------------------------------------------------------------------------------//
2)
#include<stdio.h>
int main()
{
long int n; //Tc3.0ºÃÏñÊÇ16λ±àÒëÆ÷
printf("ÊäÈë8λ16œøÖÆÊý£º");
scanf("%x",&n);
printf("%f\n",*((float*)&n));
return 0;
}
//---------------------------------------------------------------------------------------------------------------------------------------------------//
3)
#include <stdio.h>
int main(void)
{
float a=0.0f;
unsigned char * b = (unsigned char*)&a;
char c[4] = {0x4B,0xDA,0x74,0x0C};
int i = 0;
printf("b1:%d\n",b);
for(i = 0; i<4; i++){
b[i] = (unsigned char)c[i];
}
printf("b2:%d\n",*b);
printf("œá¹ûΪ£º\n");
printf("%f\n", a);
//printf("a:%d\n",a);
}
//--------------------------------------------------------------------------------------------------------------------------------------------------//
4)
#include <stdio.h>
float Hex_To_Decimal(unsigned char *Byte,int num)//Ê®ÁùœøÖƵœž¡µãÊý
{
int i;
char cByte[4];//·œ·šÒ»
for (i=0;i<num;i++)
{
cByte[i] = Byte[i];
}
float pfValue=*(float*)&cByte;
return pfValue;
return *((float*)Byte);//·œ·š¶þ
}
long FloatTohex(float HEX)//ž¡µãÊýµœÊ®ÁùœøÖÆת»»1
{
return *( long *)&HEX;
}
void FloatToByte(float floatNum,unsigned char* byteArry)////ž¡µãÊýµœÊ®ÁùœøÖÆת»»2
{
int i;
char* pchar=(char*)&floatNum;
for(i=0;i<sizeof(float);i++)
{
*byteArry=*pchar;
pchar++;
byteArry++;
}
}
void main()
{
unsigned char floatToHex[4];
unsigned char hexbyte[4]={0x4b,0xda,0x74,0x0c};//Ž«ÊäÊýŸÝΪ3d cc cc cd
float Hdecimal=0.0;
float flh=0.4;
// int num=sizeof(hexbyte);
// printf("num= %d\n",num);
Hdecimal=Hex_To_Decimal(hexbyte,sizeof(hexbyte));//Ê®ÁùœøÖÆת»»Îªž¡µãÊý
printf("\n ž¡µãÊýΪ£º\n %f\n",Hdecimal);
long hX=FloatTohex(Hdecimal);//ž¡µãÊýת»»ÎªÊ®ÁùœøÖÆÒ»
printf("\nÕýÐòÊ®ÁùœøÖÆÖµ£º\n %f=%X \n",Hdecimal,hX);//ÕýÐòÏÔÊŸ
FloatToByte(Hdecimal,floatToHex);//ž¡µãÊýתΪʮÁùœøÖƶþ
printf("\nµ¹ÐòÊ®ÁùœøÖÆ£º\n%f=%x %x %x %x\n",Hdecimal,floatToHex[0],floatToHex[1],floatToHex[2],floatToHex[3] );//µ¹ÐòÏÔÊŸ
FloatToByte(flh,floatToHex);//ž¡µãÊýתΪʮÁùœøÖƶþ
printf("\nµ¹ÐòÊ®ÁùœøÖÆ£º\n%f=%x %x %x %x\n",flh,floatToHex[0],floatToHex[1],floatToHex[2],floatToHex[3] );//µÍλÔÚÇ°
FloatToByte(flh,floatToHex);//ž¡µãÊýתΪʮÁùœøÖƶþ
printf("\nÕýÐòÊ®ÁùœøÖÆ£º\n%f=%x %x %x %x\n",flh,floatToHex[3],floatToHex[2],floatToHex[1],floatToHex[0] );//žßλÔÚÇ°
}
