Table of Contents

## What is the difference between float double and long?

They have different sizes and precision. Basically all of them represent the decimal values such as 3.14 The main difference between them is that in float we can store values upto 4 bytes (6 places after decimal point) Double upto 8 bytes And long double even more than float and double.

**What is difference between float and double in C++?**

Difference between float and double in C/C++ What’s the difference? double has 2x more precision than float. float is a 32 bit IEEE 754 single precision Floating Point Number – 1 bit for the sign, 8 bits for the exponent, and 23* for the value. float has 7 decimal digits of precision.

### What is the difference between long long and double?

The main difference between long and double in Java is that long is a data type that stores 64 bit two’s complement integer while double is a data type that stores double prevision 64 bit IEEE 754 floating point. In brief, long is an integral type whereas double is a floating point type.

**What is the difference between float double and integer?**

A float has 7 decimal digits of precision and occupies 32 bits . A double is a 64-bit IEEE 754 double-precision floating-point number. 1 bit for the sign, 11 bits for the exponent, and 52 bits for the value. A double has 15 decimal digits of precision and occupies a total of 64 bits .

#### Should I use long or double?

If you need either more digits in the number, or a bigger range, move to double , and if that’s not good enough, use long double . But for most things, double should be perfectly adequate.

**Is Long bigger than double?**

In an article on MSDN, it states that the double data type has a range of “-1.79769313486232e308 .. 1.79769313486232e308”. Whereas the long data type only has a range of “-9,223,372,036,854,775,808 .. 9,223,372,036,854,775,807”.

## Is float faster than double C++?

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 use a long over a double?**

### Is double bigger than long?

A simple answer is that double is only accurate to 15-16 total digits, as opposed to long which (as an integer type) has an absolute accuracy within an explicit digit limit, in this case 19 digits. (Keep in mind that digits and values are semantically different.)

**Why is float bigger than long?**

long represent Int64 type i.e an integral number while float represents Single type i.e a floating point number. And even though the size of long is larger than that of float, it is not possible to convert from a float to an integer without loosing information. For more information on long and float type refer msdn.

#### Should I use float or long?

Float and double 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. For example, to store the annual salary of the CEO of a company, double will be a more accurate choice.

**How big is long long C++?**

Long

Data Type | Size (in bytes) | Range |
---|---|---|

int | 4 | -2,147,483,648 to 2,147,483,647 |

long int | 4 | -2,147,483,648 to 2,147,483,647 |

unsigned long int | 4 | 0 to 4,294,967,295 |

long long int | 8 | -(2^63) to (2^63)-1 |

## Why do we use long long in C++?

long long int data type in C++ is used to store 64-bit integers. It is one of the largest data types to store integer values, unlike unsigned long long int both positive and negative.

**What is double and float in C?**

double has 2x more precision then float.. float is a 32 bit IEEE 754 single precision Floating Point Number1 bit for the sign, (8 bits for the exponent, and 23* for the value), i.e. float has 7 decimal digits of precision.

### What is double vs float?

float vs double: The float is a single precision 32 bit IEEE 754 floating point data type. The double is a double precision 64 bit IEEE 754 floating point data type. Number of Bytes: The float is 4 bytes long. The double is 8 bytes long. Default Values: The default value of float is 0.0f. The default value of double is 0.0d. Keyword

**What is a double and a float?**

Float and Double both are the data types under Floating-point type. The Floating-point numbers are the real numbers that have a fractional component in it. The primary difference between float and double is that the float type has 32-bit storage. On the other hand, the double type has 64-bit storage.

#### What is a double precision float?

In double precision,64 bits are used to represent floating-point number.