Java's Float.floatToIntBits implementation code in C\C++

Question

I want the source code for java's Float.floatToIntBits() implementation code in C\C++.

score 6 · Answer 1 · edited May 23 '17 at 11:54

6

This seems to be the best solution:

#include <cstring>

unsigned float_to_bits(float x)
{
    unsigned y;
    memcpy(&y, &x, 4);
    return y;
}

Of course this depends on float and unsigned consuming 4 bytes.

edited May 23 '17 at 11:54

Community

1
1

answered Dec 20 '10 at 14:47

fredoverflow

256,549
94
388
662

1

I would use `uint32_t` instead of `unsigned`. Otherwise this is a good answer. – R.. GitHub STOP HELPING ICE Dec 20 '10 at 17:22
3

I _think_ that this is implementing floatToRawIntBits rather than floatToIntBits – Duncan McGregor Mar 16 '11 at 10:28

score 1 · Answer 2 · answered Dec 20 '10 at 14:17

Google Codesearch says

public static int floatToIntBits(float value) {
        int result = floatToRawIntBits(value);
        // Check for NaN based on values of bit fields, maximum
        // exponent and nonzero significand.
        if ( ((result & FloatConsts.EXP_BIT_MASK) ==
              FloatConsts.EXP_BIT_MASK) &&
             (result & FloatConsts.SIGNIF_BIT_MASK) != 0)
            result = 0x7fc00000;
        return result;
    }

Follow the link for the constants.

Java's Float.floatToIntBits implementation code in C\C++

2 Answers2