Compilare: user.cpp: In function ‘int calculare(int, int)’: user.cpp:16:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i]!=':' && i<s.size()) ^ user.cpp:35:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size()) ^ user.cpp: In function ‘int main()’: user.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<s.size();j++) ^ user.cpp: In function ‘int calculare(int, int)’: user.cpp:48:1: warning: control reaches end of non-void function [-Wreturn-type] } ^