spioni1.cpp: In function `void codificare(char*)': spioni1.cpp:20: warning: comparison between signed and unsigned integer expressions spioni1.cpp: In function `char* decodificare(char*, char*)': spioni1.cpp:33: warning: address of local variable `s' returned spioni1.cpp:43: warning: comparison between signed and unsigned integer expressions spioni1.cpp:41: warning: address of local variable `s' returned spioni1.cpp: In function `int main()': spioni1.cpp:57: warning: char format, different type arg (arg 2) spioni1.cpp:65: warning: comparison between signed and unsigned integer expressions