A detailed introduction to floating-point (float)

What is a floating-point (float) data type? Floating-point data types are our common decimals, like "0.7", "100.2" are floating-point data, floating-point data types can be used to store integers or to store decimals. It's more accurate than the integer data type we talked about earlier. The valid range for floating-point is 1.8e-308~1.8e+308. Before PHP4.0, floating-point identification is double, also known as double-precision floating-point number, there is no difference between floating point data default has two writing formats, a standard format, the following 3.1415-35.8 also has a scientific notation format 3.14*10^3 You can use 3.14E3 to represent a floating-point (float) data type example in the following example, we will test for different numbers. PHP Var_dump () returns the data type and value of the variable: <?php$x = 10.3605;var_dump ($x); echo "<br>"; $x &nb

1. PHP: Floating-point type (float) data type instance detailed

Summary: Floating-point data types are our common decimals, like "0.7", "100.2" are floating-point data, floating-point data types can be used to store integers, or to store decimals. It's more accurate than the integer data type we talked about earlier. The valid range for floating-point is 1.8e-308~1.8e+308.

2. Floating-point (float) parsing PHP data type

Summary: Floating point (also known as floating point float, doubles double or real) can define:<?php$a=1.234; $b =1.2e3 with any of the following syntax; $c =7e-10; > Floating-point number in the form of: Lnum ...

3. PHP floating point type (float)

Summary: The precision of floating-point numbers is limited. Although depending on the system, PHP typically uses IEEE 754 double-precision format, the maximum relative error caused by rounding is 1.11e-16. A non-basic mathematical operation may give greater error and take into account the error transfer during the composite operation.

4. What type of PHP data does PHP determine for a character type?

Introduction: PHP Judgment character type: PHP to determine the character type of PHP data types have? : There are three main categories: 1, the basic data type: integer type (integers), can be positive, negative integer decimal, octal, hexadecimal, float (float), String type (String), Boolean type (Boolean), 2, Composite data type: Array Object (object) 3, special data type: null () resource type (Resource) Note:1> A variable is considered null in the following cases: is assigned null. has not yet been assigned. Be unset ().

5. Data type in PHP (1) _php tutorial

Introduction: Data Type in PHP (1). PHP supports eight primitive types. Four scalar types: Boolean (Boolean) integer (integer) floating-point (float) (floating-point, also Double) string (string)

6. PHP supports 8 primitive types

Summary: PHP supports eight primitive types for eight primitive PHP types. Four scalar types: Boolean (Boolean) ――true or Fasle two are case insensitive integer (integer) ――32-bit systems, range:-2 147 483 648~+2 147 483 647 Float (float) (floating-point, also "Doub Le ") ――32-bit system, range: 1.7e-308~

7. PHP supports 8 primitive types

Summary: PHP supports eight primitive types for eight primitive PHP types. Four scalar types: Boolean (Boolean)--true or Fasle two are case insensitive integer (integer)-32-bit system, Range: 2 147 483 648~+2 147 483 647 Float (float) (floating-point, also "Doub Le ")--32-bit system, range: 1.7e-308~1

8. Data type in PHP (1)

Introduction: Data Type in PHP (1). PHP supports eight primitive types. Four scalar types: Boolean (Boolean) integer (integer) floating-point (float) (floating-point, also Double) string (string)

9. PHP Data Type 01

Introduction: 1. Data type: Scalar type: integer (int), float (float), String type (String), Boolean (Boolean) conforming type: Array, object (objects) other type: resource (Resource), NULL 2. $a = 123; Echo 11$a; $a can play out echo 11$a11; $a, PHP default $A11 is a