Decimal Fraction to Binary Number Convertion

Here is a function that I have written before. It prints a float variable in 1's and 0's as it is stored in the memory (it is stored with the IEEE single precision floating point numbers standard).

void printFloat(float a)
{
	unsigned long* temp = (unsigned long*)&a;
	unsigned long one = 1;

	for(int  i = 31; i >= 0; i--)
	{
		if(((*temp) & (one << i)) == 0)
			cout << "0";
		else cout << "1";

		if (i % 4 == 0)
			cout << " ";
	}

	cout << endl;
}

I'm not sure if this is what you need. Hope it helps.