Compilare: user.cpp: In function ‘int main()’: user.cpp:23:9: warning: unused variable ‘a’ [-Wunused-variable] int a, b; ^ user.cpp:23:12: warning: unused variable ‘b’ [-Wunused-variable] int a, b; ^ user.cpp:25:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &T); ^ user.cpp:29:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &a, &b, &c); ^