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#include <stdio.h>
 
void sthng_fun(int i)
{
	if (i) {
		static int counter = 0;
		counter++;
		printf("this function was called %d times with non-zero argument\n", counter);
	} else {
		printf("this function has been called %d times with non-zero argument\n", counter);
	}
 
}
 
int main(void)
{
	sthng_fun(1);
	sthng_fun(1);
	sthng_fun(1);
 
	return 0;
}
 

prog.c: In function 'sthng_fun':
prog.c:10:77: error: 'counter' undeclared (first use in this function)
   printf("this function has been called %d times with non-zero argument\n", counter);
                                                                             ^
prog.c:10:77: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty