smiley.cpp: In function 'int main()': smiley.cpp:26: warning: array subscript has type 'char' smiley.cpp:29: warning: array subscript has type 'char' smiley.cpp:31: warning: operation on 'ptr' may be undefined smiley.cpp:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result smiley.cpp:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result