Compilare: main.cpp: In function 'int main()': main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(s); i++) ~^~~~~~~~~~ main.cpp:32:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(isdigit(s[i]) && i<strlen(s)) ~^~~~~~~~~~