Compilare: user.c: In function ‘readfrom’: user.c:54:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", n); ^ user.c:56:3: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &a[i]); ^ user.c:57:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", m); ^ user.c:60:3: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &k, &j); ^ user.c: In function ‘cautare2’: user.c:45:9: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] return (id + 1); ^ user.c: In function ‘readfrom’: user.c:45:9: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.c:35:35: note: ‘id’ was declared here int start = 0, end = n - 1, mid, id; ^