MullOverThings

Useful tips for everyday

# When should you not use floats?

## When should you not use floats?

All floating point values that can represent a currency amount (in dollars and cents) cannot be stored exactly as it is in the memory. So, if we want to store 0.1 dollars (10 cents), float/double can not store it as it is.

## Which requires more memory int or float?

An int and float usually take up “one-word” in memory. While float s can represent numbers of greater magnitude, it cannot represent them with as much accuracy, because it has to account for encoding the exponent. The exponent itself could be quite a large number.

## What is a limitation of ints compared to floats?

As you probably know, both of these types are 32-bits. int can hold only integer numbers, whereas float also supports floating point numbers (as the type names suggest). How is it possible then that the max value of int is 231, and the max value of float is 3.4*1038, while both of them are 32 bits?

## Is it better to use double or float?

Double is more precise than float and can store 64 bits, double of the number of bits float can store. Double is more precise and for storing large numbers, we prefer double over float. Unless we do need precision up to 15 or 16 decimal points, we can stick to float in most applications, as double is more expensive.

## Is double slower than float?

Floats are faster than doubles when you don’t need double’s precision and you are memory-bandwidth bound and your hardware doesn’t carry a penalty on floats. They conserve memory-bandwidth because they occupy half the space per number. There are also platforms that can process more floats than doubles in parallel.

## Why are floats bad for money?

The float and double types are particularly ill-suited for monetary calculations because it is impossible to represent 0.1 (or any other negative power of ten) as a float or double exactly. For example, suppose you have \$1.03 and you spend 42c. How much money do you have left? System.

## Why is floating bad?

Because of this ability, floats have been used in web layouts time and time again. Since they weren’t considered for full web layouts when they were built, using floats as such usually leads to layouts breaking unexpectedly, especially when it comes to responsive design, and that can get quite frustrating.

## Can I use float instead of int?

4 Answers. Floating point numbers are approximations in many cases. Some integers (and decimals) can be exactly represented by a float , but most can’t. For example, when you’re dealing with money calculations, it’s better to use integers, or (if speed is not an issue) the decimal module.

## What is the value of 0x80000000 float?

-0.0
According to this online IEEE-754 floating-point format converter 0x80000000 should be a -0.0, since floating-point format uses sign-magnitude format, which supports -0.0.

## Should I use decimal or float?

Float stores an approximate value and decimal stores an exact value. In summary, exact values like money should use decimal, and approximate values like scientific measurements should use float. When multiplying a non integer and dividing by that same number, decimals lose precision while floats do not.

## When to use int or float in C + +?

As we know, the ‘int’ data type is used to hold integers and whole numbers, while the ‘float’ data type is used to define variables holding real and fractional numbers. However, I do find that I can place an integer into a variable of the ‘float’ data type just as easily, removing the need to use the ‘int’ type?

## Which is faster, an int or a float?

Doing basic math operations with int is around 30% faster than float. If you need to save RAM and your integer numbers are small enough, you can use short (System.Int16) or even byte instead of int, however int32 is a little faster than both. On a desktop CPU anyway; not sure about ARM.

## What’s the difference between INT AND FLOAT in Excel?

As we know, the ‘int’ data type is used to hold integers and whole numbers, while the ‘float’ data type is used to define variables holding real and fractional numbers.

## Why do I use INTs instead of floats in Python?

When a reader of the code sees that you used an integer, that reader can infer that the quantity is only meant to take integer values. A philosophy of “don’t use what you don’t need”. A lot of programs have no need for non-integer values but use integer values a lot, so an integer type reflects the problem domain.