reteta.cpp: In function `int main()': reteta.cpp:13: warning: comparison between signed and unsigned integer expressions reteta.cpp:18: warning: comparison between signed and unsigned integer expressions reteta.cpp:21: warning: comparison between signed and unsigned integer expressions reteta.cpp:31: warning: comparison between signed and unsigned integer expressions reteta.cpp:37: warning: comparison between signed and unsigned integer expressions reteta.cpp:43: warning: assignment to non-pointer type `char' from NULL reteta.cpp:43: warning: argument to non-pointer type `char' from NULL reteta.cpp:50: warning: comparison between signed and unsigned integer expressions reteta.cpp:53: warning: comparison between signed and unsigned integer expressions