Compilare: main.cpp: In function 'int main()': main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < s.size() ; j++) ~~^~~~~~~~~~ main.cpp:39:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[j] >= '0' && s[j] <= '9' && j < s.size()) ~~^~~~~~~~~~ main.cpp:59:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < s.size() ; j++) ~~^~~~~~~~~~ main.cpp:63:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[j] >= '0' && s[j] <= '9' && j < s.size()) ~~^~~~~~~~~~ main.cpp:101:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < s.size() ; j++) ~~^~~~~~~~~~ main.cpp:105:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[j] >= '0' && s[j] <= '9' && j < s.size()) ~~^~~~~~~~~~