Compilare: user.cpp: In function ‘int main()’: user.cpp:89: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:99: warning: comparison between signed and unsigned integer expressions user.cpp:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:60: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:55: warning: ‘st’ may be used uninitialized in this function