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C Language > Learn C Language > What is a macro, and how do you use it?
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What is a macro, and how do you use it?

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Tutor of C, Core Java, having 5 years of development experience in DRDO, Bangalore and Honeywell

Macro is used where we want to use a value many times in a code. Also there is a possibility that the in future, the value would change. Then changing the value all over the code does not make any sense. There has to be a way out through which one can make the change at one place and it would get reflected...
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Macro is used where we want to use a value many times in a code. Also there is a possibility that the in future, the value would change. Then changing the value all over the code does not make any sense. There has to be a way out through which one can make the change at one place and it would get reflected at all the places read less
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Macro refers to a #define definition that is used to define words to enhance readability and understandability of the program.It defines an identifier and string or constant that is substituted for the identifier each time it is encountered in the program.This identifier is called a macro and the replacement...
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Macro refers to a #define definition that is used to define words to enhance readability and understandability of the program.It defines an identifier and string or constant that is substituted for the identifier each time it is encountered in the program.This identifier is called a macro and the replacement procedure is termed macros substitution. example :- #define m 10 void main(){ int b,c; b=m+1; c=b*m; printf("%d\t%d",b,c); } In the above program, we consider two statement 1. b=m+1 in this the value of m is substituted to 2 and then add 1 so result is 3 which is assigned to b, 2. c=b*m we have obtained the value of b is 3 and the value of variable m is substitute to 2, hence result is 6, assigned to c. read less
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Engineer by profression, Tutor by passion

A macro is a name given to a "block of the code" which can be substituted where the code snippet is to be used for more than once. Different ways of using macros are as follows: 1) Defining Macros without values eg- #define MACRO1. In this case we use them as testing conditions along with ifdef statements. 2)...
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A macro is a name given to a "block of the code" which can be substituted where the code snippet is to be used for more than once. Different ways of using macros are as follows: 1) Defining Macros without values eg- #define MACRO1. In this case we use them as testing conditions along with ifdef statements. 2) Macros with values,eg - #define MACRO1 25. In the preprocessing stage of the compilation process, the name of this macro is replaced with macros value all over the code. 3) Macros with piece of code as their values, eg - #define MACRO(i) (i*78) * (45+x) read less
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Related Questions

How do you override a defined macro?
We can use the #ifdef and #undef directive to undefine a previously defined macro.
Sharmistha
What is the best website to learn c language?
First go through the book "Let Us C" by Yashawant Kanetkar, then try to implement few small codes by your own, it takes time but you will learn it properly by experience only
Nom
Is a default case necessary in a switch statement?
NO, default is optional and you can omit it if there is no use of it.
My
Is it necessary to mention the header files in the C programming language?
yaa !!!!! it is necessary because we need the data present in evey header file...like example we can do mathematical calculations with the help of math header file.
Hari
Why are there so many programming languages if most programmers use C, C++, Java, and PHP?
This question has the same answer as the question"Why there are so many languages?" has... As they were ask meant for different purpose to serve for different platforms... For short: Link it to the languages used
Veerendra
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