Compilare: user.cpp: In function ‘int main()’: user.cpp:7:10: warning: unused variable ‘m’ [-Wunused-variable] int m ,n ,val , lin ,col ,p2; ^ user.cpp:7:13: warning: unused variable ‘n’ [-Wunused-variable] int m ,n ,val , lin ,col ,p2; ^ user.cpp:7:32: warning: unused variable ‘p2’ [-Wunused-variable] int m ,n ,val , lin ,col ,p2; ^ user.cpp:8:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin ,"%d%d" ,&lin ,&col); ^