Compilare: main.cpp: In function 'int main()': main.cpp:16:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<s.size()) ~~~^~~~~~~~~ main.cpp:24:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[ind]>='0' and s[ind]<='9' and ind<s.size()) ~~~^~~~~~~~~ main.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind>=s.size()) ~~~^~~~~~~~~~