Compilare: user.cpp: In function ‘int main()’: user.cpp:9: warning: unused variable ‘ok’ user.cpp:9: warning: unused variable ‘tot’ user.cpp:9: warning: unused variable ‘a2’ user.cpp:9: warning: unused variable ‘b2’ user.cpp:9: warning: unused variable ‘c’ user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:9: warning: ‘a’ may be used uninitialized in this function user.cpp:9: warning: ‘b’ may be used uninitialized in this function