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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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A macro is a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro. There are two kinds of macros. They differ mostly in what they look like when they are used. Object-like macros resemble data objects when used, function-like macros resemble...
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A macro is a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro. There are two kinds of macros. They differ mostly in what they look like when they are used. Object-like macros resemble data objects when used, function-like macros resemble function calls. read less
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Macro is a preprocessor directive we can give any name to any thing it doesn't give any errors compailer replace that names preprocessor stage only
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website and mobile application development training, digital marketing training

A macro is a name given to a block of C statements as a preprocessor directive. Being a pre-processor, the block of code is communicated to the compiler before entering into the actual coding (main () function). A macro is defined with the preprocessor directive, #define.
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Macros are generally used to define constant values that are being used repeatedly in program. Macros can even accept arguments and such macros are known as function-like macros. It can be useful if tokens are concatenated into code to simplify some complex declarations. Macros provide text replacement...
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Macros are generally used to define constant values that are being used repeatedly in program. Macros can even accept arguments and such macros are known as function-like macros. It can be useful if tokens are concatenated into code to simplify some complex declarations. Macros provide text replacement functionality at pre-processing time. Here is an example of a simple macro : #define MAX_SIZE 10 The above macro (MAX_SIZE) has a value of 10. Here is a simple program #include #define MAX_SIZE 10 int main(void) { int size = 0; size = size + MAX_SIZE; printf("%d",size); return 0; } read less
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macro is single line code block, e.g. #define area(r) (3.1415*(r)*(r)) where ever you refer to the macro area(r), it will be replace with the actual code block defined in macro radius=10; area=area(radius); so in the above code the macro is replaced with the actual code area=(3.1415*(radi...
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macro is single line code block, e.g. #define area(r) (3.1415*(r)*(r)) where ever you refer to the macro area(r), it will be replace with the actual code block defined in macro radius=10; area=area(radius); so in the above code the macro is replaced with the actual code area=(3.1415*(radius)*(radius)) read less
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A macro is a name given to a block of C statements as a pre-processor directive. Being a pre-processor, the block of code is communicated to the compiler before entering into the actual coding (main () function). A macro is defined with the preprocessor directive, #define. Before compilation, the name...
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A macro is a name given to a block of C statements as a pre-processor directive. Being a pre-processor, the block of code is communicated to the compiler before entering into the actual coding (main () function). A macro is defined with the preprocessor directive, #define. Before compilation, the name of macro is replaced by the defined macro body. The speed of the execution of the program is the major advantage of using a macro. Disadvantage: The size of the program is large. Example: #include"stdio.h" #define X 100 void main() { printf("%d",X); } read less
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International Corporate Trainer For dotnet Core ,Angular 2 ,C ,C++ and LPT Marathi for RBI Banking

Macro in C is also called symbolic constant , it replaces the code part. ex:#define line "\n..................\n", ex: #define Square(x) (x)*(x), this is called function macro it will work as Square(5) = 25 but it is not type safe user may enter alphabet instead of number and progam will fail. better...
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Macro in C is also called symbolic constant , it replaces the code part. ex:#define line "\n..................\n", ex: #define Square(x) (x)*(x), this is called function macro it will work as Square(5) = 25 but it is not type safe user may enter alphabet instead of number and progam will fail. better way is to use user defined function read less
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printf ("File Name = %s.\n",__FILE__);
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Oracle, Hindi, C++, C, MS Office, VBScript,JavaScript,Spoken English etc with 29 years of experience

Macros automate frequently-used tasks; many are created with VBA and are written by software developers. However, some macros pose a potential security risk.
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IT Professional Trainer with 13 years of experience in IT industry + Academics

It is preprocessor directive which is being included prior to compilation process of a program.
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