Compilare: user.cpp: In function ‘int main()’: user.cpp:15:42: warning: unused variable ‘lin’ [-Wunused-variable] int x1,y1,x,y,l,i,flag,d,j,contur,nr,lin,col,in; ^ user.cpp:15:46: warning: unused variable ‘col’ [-Wunused-variable] int x1,y1,x,y,l,i,flag,d,j,contur,nr,lin,col,in; ^ user.cpp:18:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d%d" ,&x,&y,&n,&l); ^ user.cpp:24:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&d); ^