tcif.cpp: In function `int main()': tcif.cpp:56: warning: comparison between signed and unsigned integer expressions tcif.cpp:69: warning: comparison between signed and unsigned integer expressions tcif.cpp:95: warning: comparison between signed and unsigned integer expressions tcif.cpp:117: warning: comparison between signed and unsigned integer expressions /tmp/cc1RKuSq.o(.text+0x6e): In function `main': : the `gets' function is dangerous and should not be used.