Compilare: main.cpp: In function 'int main()': main.cpp:14:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=strlen(l);i++) ~^~~~~~~~~~~ main.cpp:8:19: warning: unused variable 'm' [-Wunused-variable] char l[10000],m[10000]; ^ main.cpp:9:10: warning: unused variable 'cifre' [-Wunused-variable] char cifre[]="0123456789"; ^~~~~