Compilare: user.cpp: In function ‘int main()’: user.cpp:27:27: warning: unused variable ‘dr’ [-Wunused-variable] int n,i,e1,e2,g1,g2,j,dr,st; ^ user.cpp:27:30: warning: unused variable ‘st’ [-Wunused-variable] int n,i,e1,e2,g1,g2,j,dr,st; ^ user.cpp:28:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ user.cpp:30:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&e1,&e2,&g1,&g2); ^