Usually, I use the float type when I don't need much precision — for example, for money — which is wrong, but is what I'm used to wrongly do.

On the other hand, I use double when I need more precision, for example for complex mathematical algorithms.

The C99 standard says this:

There are three floating point types: float, double, and long double. The type double provides at least as much precision as float, and the type long double provides at least as much precision as double. The set of values of the type float is a subset of the set of values of the type double; the set of values of the type double is a subset of the set of values of the type long double.

I never really used long double, but I don't use C/C++ so much. Usually I use dynamically typed languages like Python, where you don't have to care about the types.

For further information about Double vs Float, see this question at SO.

Usually, I use the float type when I don't need much precision — for example, for money — which is wrong, but is what I'm used to wrongly do.

On the other hand, I use double when I need more precision, for example for complex mathematical algorithms.

The C99 standard says this:

There are three floating point types: float, double, and long double. The type double provides at least as much precision as float, and the type long double provides at least as much precision as double. The set of values of the type float is a subset of the set of values of the type double; the set of values of the type double is a subset of the set of values of the type long double.

I never really used long double, but I don't use C/C++ so much. Usually I use dynamically typed languages like Python, where you don't have to care about the types.

For further information about Double vs Float, see this question at SO.

Usually, I use the float type when I don't need much precision — for example, for money.

On the other hand, I use double when I need more precision, for example for complex mathematical algorithms.

The C99 standard says this:

There are three floating point types: float, double, and long double. The type double provides at least as much precision as float, and the type long double provides at least as much precision as double. The set of values of the type float is a subset of the set of values of the type double; the set of values of the type double is a subset of the set of values of the type long double.

I never really used long double, but I don't use C/C++ so much. Usually I use dynamically typed languages like Python, where you don't have to care about the types.

For further information about Double vs Float, see this question at SO.

Usually, I use the float type when I don't need much precision — for example, for money — which is wrong, but is what I'm used to wrongly do.

On the other hand, I use double when I need more precision, for example for complex mathematical algorithms.

The C99 standard says this:

There are three floating point types: float, double, and long double. The type double provides at least as much precision as float, and the type long double provides at least as much precision as double. The set of values of the type float is a subset of the set of values of the type double; the set of values of the type double is a subset of the set of values of the type long double.

I never really used long double, but I don't use C/C++ so much. Usually I use dynamically typed languages like Python, where you don't have to care about the types.

For further information about Double vs Float, see this question at SO.