charlie.cpp: In function `int main(int, const char**)': charlie.cpp:88: warning: comparison between signed and unsigned integer expressions charlie.cpp:25: warning: unused variable `int l' charlie.cpp:25: warning: unused variable `int secv' /tmp/cc5E8vrC.o(.text+0x5d): In function `main': : the `gets' function is dangerous and should not be used.