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C Language > Learn C Language > What is #line used for?
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What is #line used for?

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# is a preprocessor directive. so it is used in the c program by two way. 1. such as #include stdio.h In this line to read all the library function of stdio.h before processing the program. 2. # define MAX 10. in this line you define MAXas a global variable for whole program. that is you can use...
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# is a preprocessor directive. so it is used in the c program by two way. 1. such as #include stdio.h In this line to read all the library function of stdio.h before processing the program. 2. # define MAX 10. in this line you define MAXas a global variable for whole program. that is you can use MAX any where in the program and it will consider as a 10. read less
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13yrs exp. Math, Computers, Science, English Trainer. Improvement In Scores Guaranteed.

.. To include header files.
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Thank You for your Question... The #line pre-processor directive is used to reset the values of _FILE_ and _LINE_ macros. These are useful in generating an error message to report an inconsistency detected by the program. Thanks, Team DishaaPro
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Python and Unix Professional(10 years IT Exp)

A preprocessor line control directive supplies line numbers for compiler messages. It causes the compiler to view the line number of the next source line as the specified number.
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Computer & Maths Wizard

Line starting with # is used for preprocessor
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Technology expert

# called as pre processor directive. It directs the compiler to goto the perticular header files and get the information about the built-in functions.
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Doing mathematics & computing from IIT Delhi

#line is used to include a library in c,c++. eg: #include fstream this is a file stream. It is used to read and write a file.
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IT Professional Trainer with 13 years of experience in IT industry + Academics

Preprocessor directives which is being included before compilation process of a C program
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Computer & Maths Professor

# denotes the indication of a pre-processor directive in C. The pre-processor directives are those statements that are executed first before the execution of other statements.
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C and linux Expert

this directive is used to reset the values of the _ _LINE_ _ and _ _FILE_ _ symbols, respectivel.
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