ed.cpp: In function `int main()': ed.cpp:19: warning: comparison between signed and unsigned integer expressions ed.cpp:27: warning: comparison between signed and unsigned integer expressions ed.cpp:38: warning: comparison between signed and unsigned integer expressions ed.cpp:40: warning: comparison between signed and unsigned integer expressions ed.cpp:55: warning: comparison between signed and unsigned integer expressions /tmp/cc0GMfRQ.o(.text+0x47): In function `main': : the `gets' function is dangerous and should not be used.