Compilare: user.cpp: In function ‘void lee()’: user.cpp:12:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,p=1,u=1,x,y; ^ user.cpp: In function ‘int main()’: user.cpp:61:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ user.cpp:64:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&x,&y); ^ user.cpp:67:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d%d",&xp1,&yp1,&xp2,&yp2); ^ user.cpp: In function ‘void lee()’: user.cpp:13:12: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] for(i=i;i<=n;i++) ^