sl.cpp: In function `int main()': sl.cpp:25: warning: comparison between signed and unsigned integer expressions sl.cpp:33: warning: comparison between signed and unsigned integer expressions sl.cpp:38: warning: assignment to non-pointer type `char' from NULL sl.cpp:38: warning: argument to non-pointer type `char' from NULL sl.cpp:52: warning: comparison between signed and unsigned integer expressions sl.cpp:81:2: warning: no newline at end of file /tmp/ccO28aMP.o(.text+0x69): In function `main': : the `gets' function is dangerous and should not be used.