Compilare: user.cpp: In function ‘int main()’: user.cpp:59: warning: format ‘%.3f’ expects type ‘double’, but argument 2 has type ‘clock_t’ user.cpp:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:80: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result