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C Language > Learn C Language > How can a program be made to print the line number...
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How can a program be made to print the line number where an error occurs?

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Computer & Maths Professor

The ANSI C standard includes a predefined macro named __LINE__ that can be used to insert the current source code line number in your program. This can be a very valuable macro when it comes to debugging your program and checking for logic errors.
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Computer Wizard

int print_document(char* doc_name, int destination) { switch (destination) { case TO_FILE: print_to_file(doc_name); break; case TO_SCREEN: print_preview(doc_name); break; case TO_PRINTER: ...
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int print_document(char* doc_name, int destination) { switch (destination) { case TO_FILE: print_to_file(doc_name); break; case TO_SCREEN: print_preview(doc_name); break; case TO_PRINTER: print_to_printer(doc_name); break; default: printf("Logic error on line number %d!\n", __LINE__); exit(1); } } read less
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Use printf("Line#: %d", __LINE__);
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Computer Science

The ANSI C standard includes a predefined macro named __LINE__ that can be used to insert the current source code line number in your program. This can be a very valuable macro when it comes to debugging your program and checking for logic errors.
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Computer Guru

__LINE__ - Inserts the current source code line number in your code.
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To print the line number we can use "__LINE__" Example: printf (stderr, "error at File: %s , Line: %d)", __FILE__, __LINE__);
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Teacher 4 You

use _LINE_
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