Compilare: user.cpp: In function ‘int main()’: user.cpp:5: warning: unused variable ‘b’ user.cpp:5: warning: unused variable ‘c’ user.cpp:35: warning: unused variable ‘s1’ user.cpp:35: warning: unused variable ‘s2’ user.cpp:9: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result