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#include <stdio.h>
 
int main(void)
{
	int i,arr[i],sum=0;
	for(i=0;arr[i]==999;i++)
	{
		scanf("%d",arr[i]);
	    sum = sum + arr[i];
	}
 
	printf("Av= %d",sum/i(float));
 
 
	return 0;
}
 

prog.c: In function 'main':
prog.c:8:9: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   scanf("%d",arr[i]);
         ^
prog.c:12:24: error: expected expression before 'float'
  printf("Av= %d",sum/i(float));
                        ^
prog.c:12:22: error: called object 'i' is not a function or function pointer
  printf("Av= %d",sum/i(float));
                      ^
prog.c:5:6: note: declared here
  int i,arr[i],sum=0;
      ^

Standard output is empty