Compilare: user.cpp: In function ‘int main()’: user.cpp:53:28: 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:55:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%c",&c); ^ user.cpp:60:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%c",&c); ^ user.cpp:74:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%c",&c); ^ user.cpp:87:14: warning: ‘yj’ may be used uninitialized in this function [-Wmaybe-uninitialized] fc(xj,yj); ^ user.cpp:87:14: warning: ‘xj’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:77:14: warning: ‘yr’ may be used uninitialized in this function [-Wmaybe-uninitialized] fc(xr,yr); ^ user.cpp:77:14: warning: ‘xr’ may be used uninitialized in this function [-Wmaybe-uninitialized]