PHP defines constants, the difference between const and define

define defines a multi-line macro by using `\` to divide `do { \ printf("%d\n", x); \ } while (0)` into multiple lines for definition. In a macro definition, the backslash `\` must be the last character of the macro definition and cannot be followed by spaces or comments. When using `\` for line continuation, be careful to keep the code readable and make sure there is a `\` at the end of each line.

The importance and role of the define function in PHP 1. Basic introduction to the define function In PHP, the define function is a key function used to define constants. Constants will not change their values ​​during the running of the program. Constants defined using the define function can be accessed throughout the script and are global. 2. The syntax of define function The basic syntax of define function is as follows: define("constant name","constant value&qu

Detailed explanation and code examples of const in C In C language, the const keyword is used to define constants, which means that the value of the variable cannot be modified during program execution. The const keyword can be used to modify variables, function parameters, and function return values. This article will provide a detailed analysis of the use of the const keyword in C language and provide specific code examples. const modified variable When const is used to modify a variable, it means that the variable is a read-only variable and cannot be modified once it is assigned a value. For example: constint

defineConditional compilation can be achieved using the `#ifdef`, `#ifndef`, `#if`, `#elif`, `#else` and `#endif` preprocessing directives.

This article brings you relevant knowledge about JavaScript. It mainly introduces the differences between var, let and const, as well as the relationship between ECMAScript and JavaScript. Interested friends can take a look at it. I hope Helpful to everyone.

const is a keyword that can be used to declare constants, const modifiers in function parameters, const modified function return values, and const modified pointers. Detailed introduction: 1. Declare constants. The const keyword can be used to declare constants. The value of the constant cannot be modified during the running of the program. The constant can be a basic data type, such as integer, floating point number, character, etc., or a custom data type; 2. The const modifier in the function parameters. The const keyword can be used in the parameters of the function, indicating that the parameter cannot be modified inside the function, etc.

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Correct usage of the const keyword in C++: Using const to modify a function means that the function will not modify the parameters or class members passed in. Using const to declare a function pointer means that the pointer points to a constant function.