C/C++ is easy.
union ufloat {
float f;
unsigned u;
};
ufloat u1;
u1.f = 0.3f;
Then you just output u1.u
. You can adapt this implementation.
Doubles just as easy.
union udouble {
double d;
unsigned long u;
}
because doubles are 64 bit.
Java is a bit easier: use Float.floatToRawIntBits() combined with Integer.toBinaryString() and Double.doubleToRawLongBits combined with Long.toBinaryString().