Compilare: main.cpp: In function 'int main()': main.cpp:15:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<strlen(v);) ~^~~~~~~~~~ main.cpp:34:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(isdigit(v[j])==1 && j<strlen(v)) ~^~~~~~~~~~