Compilare: user.cpp: In function ‘int main()’: user.cpp:171:18: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:174:22: 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: In function ‘void doi()’: user.cpp:108:10: warning: ‘o’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[o]+=2; ^