Compilare: user.cpp: In function ‘int main()’: user.cpp:19:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < strlen(buffer)){ ^ user.cpp:21:124: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(buffer[index] > buffer[index + 1] and buffer[index + 1] < buffer[index + 2] and index + 2 < strlen(buffer)){ ^