Compilare: user.cpp: In function ‘int main()’: user.cpp:22:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < strlen(ec); ++i ) ^ user.cpp:41:38: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (ec[i-1] = '-') ^ user.cpp:78:38: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (ec[i-1] = '-') ^ user.cpp:40:32: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr += ec[i]; ^