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The #line directive Example in C | C preprocessor programs

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mahmoud2506
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2022-05-04
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The #line directive Example in C | C preprocessor programs

The #line is a preprocessor directive in C programming language; it is used to reset the line number in the code. We can reset line number from any line in the code.

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mahmoud2506
2022-05-04
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Example:

#include <stdio.h>	/*line 1*/
/*line 2*/
int main(){	/*line 3*/
/*line 4*/
	printf("Hello world\n");	/*line 5*/
	//print current line	/*line 6*/
	printf("Line: %d\n",__LINE__);	/*line 7*/
	//reset the line number by 36	/*line 8*/
	#line 36	/*reseting*/
	//print current line	/*line 36*/
	printf("Line: %d\n",__LINE__);	/*line 37*/
	printf("Bye bye!!!\n");	/*line 39*/
/*line 40*/
	return 0;	/*line 41*/
}	/*line 42*/

Output

    Hello world
    Line: 7
    Line: 37
    Bye bye!!!

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