Borderou de evaluare (job #133887)

Compilare: user.cpp: In function ‘int main()’: user.cpp:18:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:29:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp:36:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp:47:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp:59:10: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:76:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]