Compilare: user.cpp: In function ‘int main()’: user.cpp:58:9: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] char a; ^ user.cpp:61:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&t); ^ user.cpp:64:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^