Compilare: user.cpp: In function ‘int main()’: user.cpp:24:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,k,semn=1,poz; ^ user.cpp:24:17: warning: unused variable ‘semn’ [-Wunused-variable] int i,j,n,k,semn=1,poz; ^ user.cpp:27:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:29:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%f %f",&v[i].x,&v[i].y); ^ user.cpp:41:22: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] swap(v[poz], v[1]); ^