Borderou de evaluare (job #133969)

Compilare: user.cpp: In function ‘int main()’: user.cpp:18:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:27:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp:34:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp:45:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp:72:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:84:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:99:18: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null]