Compilare: main.cpp: In function 'int main()': main.cpp:60:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < s.size() ; i++) ~~^~~~~~~~~~ main.cpp:63:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i] >= '0' && s[i] <= '9' && i < s.size()) ~~^~~~~~~~~~ main.cpp:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < s.size() ; i++) ~~^~~~~~~~~~ main.cpp:82:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i] >= '0' && s[i] <= '9' && i < s.size()) ~~^~~~~~~~~~ main.cpp:95:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < s.size() ; i++) ~~^~~~~~~~~~ main.cpp:98:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i] >= '0' && s[i] <= '9' && i < s.size()) ~~^~~~~~~~~~