Compilare: user.cpp: In function ‘int main()’: user.cpp:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int binary_search(int, int)’: user.cpp:35: warning: control reaches end of non-void function