Compilare: user.cpp: In function ‘int main()’: user.cpp:77:32: 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:81:36: 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:94:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d ", &t); ^ user.cpp:96:40: 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:100:33: 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)’: user.cpp:70:31: warning: control reaches end of non-void function [-Wreturn-type] return i; } } } }; ^