Compilare: user.cpp: In function ‘int numar(char*)’: user.cpp:10:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<strlen(x);i++) ^ user.cpp: In function ‘int main()’: user.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<strlen(s);i++) ^ /tmp/cc7IsLPI.o: In function `main': user.cpp:(.text.startup+0x50): warning: the `gets' function is dangerous and should not be used.