java hex to float_Hex to Float

方法1:

#include

typedef union Resolve {

float float_data;

unsigned char char_table[4];

} HextoFloat;

HextoFloat HextoFloat_NDI;

int main() {

//char里面只能存''或者16进制，acsii等，不能存string。。。。我好蠢

unsigned char hexByte[4] = {0x3F, 0x7E, 0x3A, 0x79};

for (int i = 0; i < 4; i++) {

HextoFloat_NDI.char_table[i] = hexByte[3 - i];

}

printf("Float = %.20f", HextoFloat_NDI.float_data);

return 0;

}

方法2：

#include

#include

#include

using namespace std;

template T getNum(unsigned char p[]) {

T temp;

memcpy(&temp, p, sizeof(T));

return temp;

}

int main() {

//0x3F7E3A79

//const char *p = "0x793A7E3F";

unsigned char p[4] = {0x79, 0x3A, 0x7E, 0x3F}; //unsigned char 0 ~ 256, char -128 ~ 127, ascii or hex range(0, 256), do not use char.

float _floatPosition;

_floatPosition = getNum(p);

int precision = 20;//精度

cout.precision(precision);

cout << fixed << "保留" << precision << "位小数的hex转float结果为：" << _floatPosition << endl;

return 0;

}

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