smiley.cpp:6: warning: deprecated conversion from string constant to 'char*' smiley.cpp:8: warning: deprecated conversion from string constant to 'char*' smiley.cpp: In function 'bool ok(char*, char)': smiley.cpp:11: warning: comparison between signed and unsigned integer expressions smiley.cpp: In function 'int main()': smiley.cpp:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result smiley.cpp:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result