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#include <stdio.h>
 
int main(void) {
	int i=0;
	int sum = 0;
	int amount = 100;
	for(i=0;i<amount;++i)
	{
		sum += tab[i];
	}
	int avg = sum/amount;
 
	int n;
	int min_diff = abs(tab[0] - avg);
	for(i=0;i<amount;++i)
	{
		int local_diff = abs(tab[i] - avg);
		if(local_diff < min_diff)
		{
			n = tab[i]; // najblizsza liczba
			min_diff = local_diff; // najmniejsza roznica
		}
	}
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:9:10: error: ‘tab’ undeclared (first use in this function)
   sum += tab[i];
          ^
prog.c:9:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:14:2: warning: implicit declaration of function ‘abs’ [-Wimplicit-function-declaration]
  int min_diff = abs(tab[0] - avg);
  ^
prog.c:13:6: warning: variable ‘n’ set but not used [-Wunused-but-set-variable]
  int n;
      ^

Standard output is empty