Compilare: user.cpp: In function ‘int main()’: user.cpp:74:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d ", &n, &m); ^ user.cpp:78:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d ", &a, &b); ^ user.cpp:91:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d ", &t); ^ user.cpp:93:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d ", &p, &s); ^ user.cpp:97:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d ", &s); ^ user.cpp: In member function ‘int the_structure::query(int) const’: user.cpp:67:19: warning: control reaches end of non-void function [-Wreturn-type] return i; } } } }; ^