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Oct 26, 2021 · When you're programming, there are times when you'll want the values of certain variables to remain unchanged. In the C language, you'll likely define them as constants. You can define constants in C in a few different ways. In this tutorial, you'll learn how to use #define and the const.
Nov 18, 2018 · #define preprocessor directive is the most useful preprocessor directive in C language. We use it to define a name for particular value/constant/expression. C preprocessor processes the defined name and replace each occurrence of a particular string/defined name (macro name) with a given value (micro body). Syntax to define a MACRO using #define
Jan 18, 2023 · A statement is a command given to the computer that instructs the computer to take a specific action, such as display to the screen, or collect input. A computer program is made up of a series of statements. Contents. 1 Labeled Statements. 2 Compound Statements. 3 Expression Statements. 4 Selection Statements. 5 Iteration Statements.
Example 1: #define preprocessor. #include <stdio.h> #define PI 3.1415 int main() { float radius, area; printf("Enter the radius: "); scanf("%f", &radius); // Notice, the use of PI . area = PI*radius*radius; printf("Area=%.2f",area); return 0; } Function like Macros. You can also define macros that work in a similar way as a function call.
#define token (<arg> [, <arg>s ... ]) statement. For instance, here is a standard way of writing a macro to return the max of two values. #define MAX(a, b) ((a) > (b) ? (a) : (b)) Note that when writing macros there are a lot of small gotchas; you can read more about it here: the c preprocessor .
Oct 15, 2013 · 7 Answers. Sorted by: 10. #define -d names have no types. They just define textual replacements. What the compiler is seeing is the preprocessed form. If using GCC, try gcc -C -E somesource.c and have a look at the (preprocessed) output. In the 1980s the preprocessor was a separate program.
Jan 30, 2023 · Define and Include in C. Prepbytes January 30, 2023. Last Updated on January 30, 2023 by Prepbytes. In this article, we will learn about preprocessor directives, define and include in C with the examples. We will also learn about the syntax of define a and include in C.
