64-bit UNIX applications

Table of Contents

## How many bits is long double?

64-bit UNIX applications

Name | Length |
---|---|

int | 4 bytes |

long | 8 bytes |

float | 4 bytes |

double | 8 bytes |

### Is long double 12 or 16 bytes?

In this format, a float is 4 bytes, a double is 8, and a long double can be equivalent to a double (8 bytes), 80-bits (often padded to 12 bytes), or 16 bytes….4.8 — Floating point numbers.

Size | Range | Precision |
---|---|---|

8 bytes | ±2.23 x 10-308 to ±1.80 x 10308 | 15-18 significant digits, typically 16 |

#### Why is long double 80 bits?

Wikipedia explains that an 80-bit format can represent an entire 64-bit integer without losing information. Thus the floating-point unit of the CPU can be used to implement multiplication and division for integers. I see, so an 80-bit FPU can pull double-duty for up to 64-bit integer arithmetic.

**Is long double 128-bit?**

With the GNU C Compiler, long double is 80-bit extended precision on x86 processors regardless of the physical storage used for the type (which can be either 96 or 128 bits), On some other architectures, long double can be double-double (e.g. on PowerPC) or 128-bit quadruple precision (e.g. on SPARC).

**How do you read a long double?**

you can use the format specifier %ld for reading long double variables. %ld is long decimal, not long double.

## How do you use a long double?

%Lf format specifier for long double %lf and %Lf plays different role in printf. So, we should use %Lf format specifier for printing a long double value.

### How many bytes is a double?

8 bytes

Data Types and Sizes

Type Name | 32–bit Size | 64–bit Size |
---|---|---|

float | 4 bytes | 4 bytes |

double | 8 bytes | 8 bytes |

long double | 16 bytes | 16 bytes |

#### How do I printf a long double?

%lf and %Lf plays different role in printf. So, we should use %Lf format specifier for printing a long double value.

**Is long double 16 bytes?**

Integers are always represented in twos-complement form in the native byte-encoding order of your system….Data Types and Sizes.

Type Name | 32–bit Size | 64–bit Size |
---|---|---|

float | 4 bytes | 4 bytes |

double | 8 bytes | 8 bytes |

long double | 16 bytes | 16 bytes |

**Is long floating point?**

float: The float data type is a single-precision 32-bit IEEE 754 floating point….Default Values.

Data Type | Default Value (for fields) |
---|---|

int | 0 |

long | 0L |

float | 0.0f |

double | 0.0d |

## How many bytes is long?

The size of the long type is 8 bytes (64 bits).

### How many bits is a long?

64 bits

Table 3-2 Sizes and Ranges of Data Types

Type | Size | Range |
---|---|---|

Integral Types | ||

long int , or signed long int (OpenVMS) | 32 bits | – 2147483648 to 2147483647 |

long int , or signed long int (Digital UNIX) | 64 bits | – 9223372036854775808 to 9223372036854775807 |

unsigned long int (OpenVMS) | 32 bits | 0 to 4294967295 |