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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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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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