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C Language > Learn C Language > What is the benefit of using #define to declare a const...
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What is the benefit of using #define to declare a constant?

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Consider a scenario where we are using a C program to generate marksheets of students. The maximum marks per subject are 100 and we are using 100 in let us say 5 formulas in the entire program. Now, if the maximum marks changes from 100 to 70, we need to make changes at 5 places if we use 100 directly....
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Consider a scenario where we are using a C program to generate marksheets of students. The maximum marks per subject are 100 and we are using 100 in let us say 5 formulas in the entire program. Now, if the maximum marks changes from 100 to 70, we need to make changes at 5 places if we use 100 directly. On the other hand, if we had used MAX constant with the help of # define, we need to change at only 1 place. read less
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Using the #define method of declaring a constant enables you to declare a constant in one place and use it throughout your program. This helps make your programs more maintainable, because you need to maintain only the #define statement and not several instances of individual constants throughout your...
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Using the #define method of declaring a constant enables you to declare a constant in one place and use it throughout your program. This helps make your programs more maintainable, because you need to maintain only the #define statement and not several instances of individual constants throughout your program. For instance, if your program used the value of pi (approximately 3.14159) several times, you might want to declare a constant for pi as follows: #define PI 3.14159 This way, if you wanted to expand the precision of pi for more accuracy, you could change it in one place rather than several places. Usually, it is best to put #define statements in an include file so that several modules can use the same constant value. read less
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Doing mathematics & computing from IIT Delhi

It becomes a global variable. You can use it main and in any function in the file.
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Thanks for the question Govind ...... The constant which have defined using #define function can be used anywhere in the program without re declaration Thanks, Team DishaaPro www.dishaapro.com
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