Q:

Print error message from any function with function name, line number in C

belongs to collection: C Preprocessors Programs

mahmoud2506
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2022-05-04
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Print error message from any function with function name, line number in C

Sometimes, it is necessary to print some message on logic failure or anytime with the function name and line number, so that program can be debugged and fixed the issue.

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mahmoud2506
2022-05-04
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Prerequisite:

  • __LINE__: To print current line number
  • __func__: To print the name of the current function

Program:

#include <stdio.h>

float devide(int a, int b)
{
	float result;
	
	if(b!=0){
		result = (float)a/(float)b;
	}
	else{
		result=0;
		printf("Error at line %d in function "%s"\n",((__LINE__)-3),__func__);
		//ERROR at 3 lines above: ((__LINE__)-3)
	}

	return result;
}

int main()
{
	printf("%f\n",devide(10,3));
	printf("%f\n",devide(10,0));	
	return 0;
}

Output

3.333333
Error at line 9 in function "devide"
0.000000

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