Compilare: user.cpp: In function ‘int main()’: user.cpp:22:20: warning: unused variable ‘nr1’ [-Wunused-variable] int t ,sol, i, nr1 ,nr2, rst; ^ user.cpp:22:25: warning: unused variable ‘nr2’ [-Wunused-variable] int t ,sol, i, nr1 ,nr2, rst; ^ user.cpp:22:30: warning: variable ‘rst’ set but not used [-Wunused-but-set-variable] int t ,sol, i, nr1 ,nr2, rst; ^ user.cpp:23:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&t); ^ user.cpp:26:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets (s,501,fin); ^