How Do I Convert Hex String To Float Value

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I have a Hex String = "41BD9A69", I need to convert this hex string into ASCII Hex IEEE Float.
I meant how do we convert this hex string into equivalent float value of 23.700396 programatically in C++ or using library.
Hex String = "41BD9A69" = 23.700396

Posted 5-Jun-14 23:29pm

LaxmikantYadav

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3 solutions

Solution 1

It's not complex, but look here: http://gregstoll.dyndns.org/~gregstoll/floattohex/[^] - it's a calculator module, that includes C source to do just that.

Posted 5-Jun-14 23:34pm

OriginalGriff

Solution 2

This should solve your problem

C#

float f;
long l;

l = strtol(HEXString, (char**)NULL, 16);
f = (float)l;

printf("%f", f);

See below for detail explanation

Convert a hexadecimal to a float and viceversa in c[^]

Posted 5-Jun-14 23:38pm

_Asif_

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CPallini 6-Jun-14 5:47am

Did you try your code?

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CPallini · Accepted Answer · 2014-06-05T23:42:00

Solution 3

You might use the union trick:

C++

#include <iostream>
#include <sstream>
#include <iomanip>
using namespace std;

union ulf
{
    unsigned long ul;
    float f;
};

int main()
{
    ulf u;
    string str = "41BD9A69";
    stringstream ss(str);
    ss >> hex >> u.ul;
    float f = u.f;
    cout << f << endl;
}

Posted 5-Jun-14 23:42pm

CPallini

Comments

Member 13995944 5-Oct-18 1:42am

I want half precision float value, My string is "00bff409", converted float vlaue is not suitable for arithmetic calculation.

CPallini 5-Oct-18 2:42am

Half precision float value, per my understanding, is a 16 bit number. You have a 24 bit one.