Compilare: user.cpp: In function ‘void read()’: user.cpp:10:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(e1);i++) ^ user.cpp:12:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(e2);i++) ^ user.cpp: In function ‘int eval(const char*, int)’: user.cpp:51:35: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(e[poz]=='|' || e[poz]=='^' && poz<l) ^