How do I convert a Python float to a hexadecimal string in python 2.5? Nonworking solution attached

Question

What I really need to do is to export a floating point number to C with no precision loss.

I did this in python:

import math
import struct
x = math.s         


        

Answer 1

repr() is your friend.

C:\junk\es2>type es2.c
#include 
#include 
#include 

int main(int argc, char** argv) {
    double expected, actual;
    int nconv;
    expected = sqrt(2.0);
    printf("expected: %20.17g\n", expected);
    actual = -666.666;
    nconv = scanf("%lf", &actual);
    assert(nconv == 1);
    printf("actual:   %20.17g\n", actual);
    assert(actual == expected);
    return 0;
    }


C:\junk\es2>gcc es2.c

C:\junk\es2>\python26\python -c "import math; print repr(math.sqrt(2.0))" | a
expected:   1.4142135623730951
actual:     1.4142135623730951

C:\junk\es2>