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
",num.m);//输出0x40a80000
printf("十进制输出float：%f
",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 ",*((float*)&n));

    return 0;

    

}

//--------------------------------------------------------------------------------------------------------------------------------------------//

2)

#include<stdio.h>

int main()

{

    long int n;  //Tc3.0ºÃÏñÊÇ16λ±àÒëÆ÷

    printf("ÊäÈë8λ16œøÖÆÊý£º");

    scanf("%x",&n);

    printf("%f ",*((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 ",b);

    for(i = 0; i<4; i++){

        b[i] = (unsigned char)c[i];

    }

    printf("b2:%d ",*b);

    printf("œá¹ûΪ£º ");

    printf("%f ", a);

    //printf("a:%d ",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 ",num);



Hdecimal=Hex_To_Decimal(hexbyte,sizeof(hexbyte));//Ê®ÁùœøÖÆת»»Îªž¡µãÊý



printf(" ž¡µãÊýΪ£º %f ",Hdecimal);



long hX=FloatTohex(Hdecimal);//ž¡µãÊýת»»ÎªÊ®ÁùœøÖÆÒ»



printf(" ÕýÐòÊ®ÁùœøÖÆÖµ£º %f=%X ",Hdecimal,hX);//ÕýÐòÏÔÊŸ



FloatToByte(Hdecimal,floatToHex);//ž¡µãÊýתΪʮÁùœøÖƶþ



printf(" µ¹ÐòÊ®ÁùœøÖÆ£º %f=%x %x %x %x ",Hdecimal,floatToHex[0],floatToHex[1],floatToHex[2],floatToHex[3] );//µ¹ÐòÏÔÊŸ



FloatToByte(flh,floatToHex);//ž¡µãÊýתΪʮÁùœøÖƶþ



printf(" µ¹ÐòÊ®ÁùœøÖÆ£º %f=%x %x %x %x ",flh,floatToHex[0],floatToHex[1],floatToHex[2],floatToHex[3] );//µÍλÔÚÇ°



FloatToByte(flh,floatToHex);//ž¡µãÊýתΪʮÁùœøÖƶþ



printf(" ÕýÐòÊ®ÁùœøÖÆ£º %f=%x %x %x %x ",flh,floatToHex[3],floatToHex[2],floatToHex[1],floatToHex[0] );//žßλÔÚÇ°



}