Compilare: user.cpp: In function ‘int main()’: user.cpp:10:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:12:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v[i]); ^ user.cpp:26:5: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (v[i] == x) { ^