Compilare: user.cpp: In function ‘int main()’: user.cpp:21: warning: comparison between signed and unsigned integer expressions user.cpp:10: warning: unused variable ‘input’ user.cpp:11: warning: unused variable ‘output’ user.cpp:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:16: warning: ‘s’ may be used uninitialized in this function