Borderou de evaluare (job #343808)

Compilare: user.cpp: In function ‘int main()’: user.cpp:38:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:40:33: warning: NULL used in arithmetic [-Wpointer-arith] user.cpp:48:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:65:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘bool stanga(char)’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type]