Compilare: user.cpp: In function ‘int numar(char*, int&)’: user.cpp:16:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i]>='0' && s[i]<='9' && i<strlen(s)) ^ user.cpp: In function ‘node* termen(int&)’: user.cpp:41:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i]==')' || (s[i]!='*' && s[i]!='/') || i>=strlen(s)) ^ user.cpp: In function ‘node* arbore(int&)’: user.cpp:52:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(s) && s[i]!=')') ^ user.cpp:63:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i>=strlen(s) || s[i]==')') ^ user.cpp: In function ‘int operatie(int, int, char)’: user.cpp:80:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘node* arbore(int&)’: user.cpp:56:22: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] p->left=r; ^ user.cpp:51:11: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] node *p,*r; ^