Compilare: user.cpp: In function ‘int main()’: user.cpp:16: warning: operation on ‘k’ may be undefined user.cpp:22: warning: operation on ‘k’ may be undefined user.cpp:24: warning: operation on ‘k’ may be undefined user.cpp:40: warning: operation on ‘k’ may be undefined user.cpp:46: warning: operation on ‘k’ may be undefined user.cpp:48: warning: operation on ‘k’ may be undefined user.cpp:6: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result