Compilare: main.cpp: In function 'int main()': main.cpp:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<strlen(s) && ok==1; i++) ~^~~~~~~~~~ main.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<strlen(s);i++) ~^~~~~~~~~~ main.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<strlen(s); i++) ~^~~~~~~~~~ main.cpp:40:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<strlen(s) && ok1==1; i++) ~^~~~~~~~~~