ecuatii.cpp: In function `int main()': ecuatii.cpp:29: warning: assignment to non-pointer type `char' from NULL ecuatii.cpp:29: warning: argument to non-pointer type `char' from NULL ecuatii.cpp:39: warning: assignment to non-pointer type `char' from NULL ecuatii.cpp:39: warning: argument to non-pointer type `char' from NULL ecuatii.cpp:48: warning: assignment to non-pointer type `char' from NULL ecuatii.cpp:48: warning: argument to non-pointer type `char' from NULL ecuatii.cpp:57: warning: assignment to non-pointer type `char' from NULL ecuatii.cpp:57: warning: argument to non-pointer type `char' from NULL /tmp/ccVUzPwe.o(.text+0x71): In function `main': : the `gets' function is dangerous and should not be used.