ec.cpp: In function `bool valid(double)': ec.cpp:17: warning: initialization to `int' from `double' ec.cpp:17: warning: argument to `int' from `double' ec.cpp: In function `int firstgrade(char*)': ec.cpp:30: warning: comparison between signed and unsigned integer expressions ec.cpp: In function `int secondgrade(char*)': ec.cpp:64: warning: comparison between signed and unsigned integer expressions