Compilare: user.cpp: In function ‘int main()’: user.cpp:13: warning: operation on ‘m’ may be undefined user.cpp:5: warning: unused variable ‘sem’ user.cpp:8: 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 user.cpp:26: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result user.cpp:5: warning: ‘S’ may be used uninitialized in this function